Find all School-related info fast with the new School-Specific MBA Forum

It is currently 30 Apr 2016, 15:02
GMAT Club Tests

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

It takes 6 technicians a total of 10 hours to build and

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

7 KUDOS received
Retired Moderator
User avatar
Status: The last round
Joined: 18 Jun 2009
Posts: 1310
Concentration: Strategy, General Management
GMAT 1: 680 Q48 V34
Followers: 74

Kudos [?]: 804 [7] , given: 157

GMAT ToolKit User
It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 12 Apr 2010, 05:41
7
This post received
KUDOS
18
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

64% (03:20) correct 36% (02:36) wrong based on 906 sessions

HideShow timer Statictics

It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM
[Reveal] Spoiler: OA

_________________

[ From 470 to 680-My Story ] [ My Last Month Before Test ]
[ GMAT Prep Analysis Tool ] [ US. Business School Dashboard ] [ Int. Business School Dashboard ]

I Can, I Will

GMAT Club Premium Membership - big benefits and savings


Last edited by Bunuel on 09 Feb 2012, 12:38, edited 1 time in total.
Edited the question
16 KUDOS received
Manager
Manager
avatar
Joined: 29 Oct 2009
Posts: 202
Concentration: General Management, Sustainability
WE: Consulting (Computer Software)
Followers: 2

Kudos [?]: 69 [16] , given: 12

Re: Work Rate Problem [#permalink]

Show Tags

New post 12 Apr 2010, 07:20
16
This post received
KUDOS
6
This post was
BOOKMARKED
Ans: C

6Techs can complete the job in 10 hours.
6 Techs can do 1/10 job in 1 hour
1 Tech can do 1/(6*10) = 1/60 job in 1 hour.

Now 6 techs worked from 11.00Am tp 5.00PM means they worked for 6 hours.
6Techs worked for 6 hours = 6/10 job completed.
From 5.00 PM to 6.00 Pm a tech is added, so
7 Techs worked for 1 hour = 7/60 job
Total job completed at 6.00PM is = 6/10+7/60 = 43/60 job done.

From 6.00 PM to 7.00 Pm a tech is added, so
8 Techs worked for 1 hour = 8/60 job
Total job completed at 7.00PM is = 43/60 + 8/60 = 51/60 job done.

From 7.00 PM to 8.00 Pm a tech is added, so
9 Techs worked for 1 hour = 9/60 job
Total job completed at 7.00PM is = 51/60 + 9/60 = 60/60 job done. Job is COMPLETE.

Job is complete at 8.00PM.
The total number of hours is 9 hours.
_________________

+1Kudos, if this helps

Expert Post
54 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 32549
Followers: 5631

Kudos [?]: 68312 [54] , given: 9797

Re: Work Rate Problem [#permalink]

Show Tags

New post 12 Apr 2010, 07:22
54
This post received
KUDOS
Expert's post
10
This post was
BOOKMARKED
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


To complete the job 6*10=60 man/hours are needed. By 5:00 PM 6*6=36 man/hour done. 24 is left.

5:00 PM - 6:00 PM 7 man/hour;
6:00 PM - 7:00 PM 8 man/hour;
7:00 PM - 8:00 PM 9 man/hour.

7+8+9=24.

Answer: C.
_________________

New to the Math Forum?
Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Retired Moderator
User avatar
Status: The last round
Joined: 18 Jun 2009
Posts: 1310
Concentration: Strategy, General Management
GMAT 1: 680 Q48 V34
Followers: 74

Kudos [?]: 804 [0], given: 157

GMAT ToolKit User
Re: Work Rate Problem [#permalink]

Show Tags

New post 12 Apr 2010, 07:38
Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 32549
Followers: 5631

Kudos [?]: 68312 [1] , given: 9797

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 30 May 2013, 05:09
1
This post received
KUDOS
Expert's post
Bumping for review and further discussion*. Get a kudos point for an alternative solution!

*New project from GMAT Club!!! Check HERE

Theory on work/rate problems: work-word-problems-made-easy-87357.html
All DS work/rate problems to practice: search.php?search_id=tag&tag_id=46
All PS work/rate problems to practice: search.php?search_id=tag&tag_id=66

_________________

New to the Math Forum?
Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
avatar
Joined: 27 Jul 2011
Posts: 51
Followers: 0

Kudos [?]: 39 [0], given: 9

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 13 Jun 2013, 19:45
This is how I approach it:
Because 6 men started at 11am and the addition of another man occurs after 5. Therefore, the amount of work done by 5pm will be = (1/10)X(17-11)= 6/10
The remaining work will thus be = 4/10

(1/10)t+(1/60)[t+(t+1)+...+(t+n)]=(4/10)
(1/10)t+(1/60)[Summation formula: ((tX(t+1))/2)]=4/10

Because t cannot be negative; therefore t=3
3+5=8

Could someone please verify that this method will work for any rate question presented. Thanks.
Intern
Intern
User avatar
Joined: 20 Feb 2011
Posts: 34
Location: United States
GMAT 1: 560 Q45 V23
WE: Information Technology (Consulting)
Followers: 0

Kudos [?]: 12 [0], given: 42

GMAT ToolKit User
Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 28 Jun 2013, 12:58
1
This post was
BOOKMARKED
6 person can complete the job in 10 hours.
Rate of work per person per hour = x
W=R*T
1=6x*10
x=1/60

Work done by 6 persons for 6 hours at rate of (1/60)=
6*6*(1/60) = 6/10

Remaining Work = 1-6/10 = 4/10

4/10 = Y(1/60)

Y=24; at 5 pm no of persons were 7, at 6pm: 8, at 7pm :9persons, 7+8+9=24

Answer C

it took 3 hours after 5pm, to complete the task.
_________________

And many strokes, though with a little axe, hew down and fell the hardest-timbered oak. - William Shakespeare

Manager
Manager
avatar
Joined: 21 Aug 2012
Posts: 150
Followers: 2

Kudos [?]: 51 [0], given: 41

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 28 Jun 2013, 20:12
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM



We should never, everrr make questions too complicated to infer and solve...
6 tech total of 10 hours... let me assume total of 60 units of work...
1 tech in 1 hr does 1 unit of work.....

11:00 am to 5:pm - 6 hours
so, total work done by 6 tech in 6 hrs will be 36 unit. ( 6*6)
now a new person gets added every hour after 5:00PM

11:00-5:00 - 36 unit
5:00-6:00 - 7 unit ( 6 tech were doing 6 unit in 1 hr, now since a new person has been added, the work increases to 7 unit)
6:00-7:00 - 8 unit ( another guy added)
7:00-8:00- 9 unit ( another guys added making total 9 person in the work field)

36+7+8+9 = 60.


so by 8:00PM 60 units of work was completed by the group....

Bingo..!!!!
_________________

MODULUS Concept ---> inequalities-158054.html#p1257636
HEXAGON Theory ---> hexagon-theory-tips-to-solve-any-heaxgon-question-158189.html#p1258308

Senior Manager
Senior Manager
User avatar
Joined: 17 Dec 2012
Posts: 427
Location: India
Followers: 22

Kudos [?]: 336 [0], given: 12

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 29 Jun 2013, 04:50
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


1. Originally 6 people work for 60 man hours
2. Additional people work for 6 man hours
3. So to complete the same task since the same man hours is taken , the original 6 people work for 6 man hours less. i.e., they work for 60-6=54 man hours i.e., they work for 9 hours each
4 . In other words if they start the task at 11 A.M , they complete the task at 8:00 PM

The answer is choice C.
_________________

Srinivasan Vaidyaraman
Sravna
http://www.sravnatestprep.com

Classroom Courses in Chennai


Last edited by SravnaTestPrep on 17 Aug 2013, 04:23, edited 2 times in total.
Manager
Manager
avatar
Joined: 26 Feb 2013
Posts: 184
Followers: 0

Kudos [?]: 34 [0], given: 25

Re: Work Rate Problem [#permalink]

Show Tags

New post 17 Aug 2013, 03:52
Bunuel wrote:
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


To complete the job 6*10=60 man/hours are needed. By 5:00 PM 6*6=36 man/hour done. 24 is left.

5:00 PM - 6:00 PM 7 man/hour;
6:00 PM - 7:00 PM 8 man/hour;
7:00 PM - 8:00 PM 9 man/hour.

7+8+9=24.

Answer: C.


Makes me giggle how Bunuel always finds a simple yet understood solution! Though first I struggle to understand the problem and the previous posters' solutions!
Thanks Bunuel!
Senior Manager
Senior Manager
avatar
Joined: 10 Jul 2013
Posts: 335
Followers: 3

Kudos [?]: 247 [0], given: 102

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 17 Aug 2013, 04:38
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


6man,
10 hours = 1 full work
6 hours = 3/5 work done. due = 1- 3/5 = 2/5

6 men 10 hours
so 7 men 60/7 hours to complete a job

so, 7 men 1 hour = 7/60
8 men 1 hour = 8/60
9 men 1 hour = 9/60
..........................................
+ 3 hours = 24/60 = 2/5 parts of total works.

so 5+3 = 8pm (Answer)
_________________

Asif vai.....

1 KUDOS received
Current Student
avatar
Joined: 03 Aug 2012
Posts: 915
Concentration: General Management, General Management
GMAT 1: 630 Q47 V29
GMAT 2: 680 Q50 V32
GPA: 3.7
WE: Information Technology (Investment Banking)
Followers: 19

Kudos [?]: 518 [1] , given: 322

Premium Member
Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 25 Sep 2013, 22:03
1
This post received
KUDOS
Man * Days * hours = Work done

6 people * 10 hours = 60 units

6 people * (11AM to 5 PM) 6 hours = 36

Work left 60-36 = 24

5-6 : 7 people = 7 units
6-7 : 8 people = 8 units
7-8: 9 people = 9 units
Total = 24 units

hence 8PM
_________________

Rgds,
TGC!
_____________________________________________________________________
I Assisted You => KUDOS Please
_____________________________________________________________________________

Current Student
avatar
Joined: 26 Sep 2013
Posts: 221
Concentration: Finance, Economics
GMAT 1: 670 Q39 V41
GMAT 2: 730 Q49 V41
Followers: 4

Kudos [?]: 103 [0], given: 40

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 20 Nov 2013, 10:23
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


Can someone explain how this fits into the standard w=r*t formula? I feel like that learning that formula was useless, because every time I try and apply it to one of these problems, it's wrong.

"It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?"

I tried this: If the rate of a technician is \(\frac{1}{T}\), and you have 6 technicians working from 9-5, then their hourly rate should be 6/T, so using w=r*t
\(w=8*\frac{6}{t}\), so W=\(\frac{48}{T}\). But then what do I do after that?
1 KUDOS received
Current Student
User avatar
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 42

Kudos [?]: 455 [1] , given: 355

GMAT ToolKit User
Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 24 Dec 2013, 13:14
1
This post received
KUDOS
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


So we need 60 hours men to finish the work
6 technitians will work for 6 hours hence they will do 36 hours. We now have 24 hours men left to complete
At 6pm - 7 hours men = 24 - 7 = 17
At 7pm - 8 hours men= 17-8 = 9
At 8pm- 9 hours men = Job Done

Hence answer is (C)

Hope it helps
Cheers!
J :)
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 9242
Followers: 454

Kudos [?]: 115 [0], given: 0

Premium Member
Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 18 Jan 2015, 00:56
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Manager
Manager
avatar
Joined: 08 Sep 2010
Posts: 72
Followers: 2

Kudos [?]: 17 [0], given: 20

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 14 Sep 2015, 07:56
Hussain15 wrote:
It takes 6 technicians a total of 10 hours to build and program a new server from Direct Computer, with each working at the same rate. If six technicians start to build the server at 11:00 AM, and one technician per hour is added beginning at 5:00 PM, at what time will the server be complete?

A. 7:30 PM
B. 7:45 PM
C. 8:00 PM
D. 9:00 AM
E. 10:00 PM


My take is Option C. I followed a simple approach:

6 technicians will take total of 10 hours => Total manhours required = 60 man hours
1 Technician added per hour after 5:00 PM..Hmm okay..

Total manhours completed till 5 PM = 6*^ = 36 manhours (11 am - 5 pm => 6 hoours)

Manhours from 5 PM - 6 PM = (6 + 1) man * 1 hour = 7 manhours
Manhours from 6 PM - 7 PM = (7 + 1) man * 1 hour = 8 manhours
Manhours from 7 PM - 8 PM = (8 + 1) man * 1 hour = 9 manhours

Total manhours till 8 PM = 36 + 7 + 8 + 9 manhours = 60 manhours. Hence option C

Thanks,
Chanakya

Hit kudos if you like the explanation
Manager
Manager
avatar
Joined: 07 Dec 2014
Posts: 214
Followers: 0

Kudos [?]: 22 [0], given: 0

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 21 Nov 2015, 15:57
it takes (6)(10)=60 technician hours to complete job
(6)(6)=36 technician hours completed from 11:00am to 5:00pm
60-36=24 technician hours remaining at 5:00pm
t=time required
ratio of cumulative technician hours to time=(t+13)/2
24/t=(t+13)/2
t=3 hours
8:00pm
SVP
SVP
avatar
Joined: 17 Jul 2014
Posts: 1562
Location: United States
GMAT 1: 550 Q39 V27
GMAT 2: 560 Q42 V26
GMAT 3: 560 Q43 V24
GMAT 4: 650 Q49 V30
GPA: 3.56
WE: General Management (Transportation)
Followers: 9

Kudos [?]: 148 [0], given: 100

GMAT ToolKit User Premium Member Reviews Badge
It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 04 Mar 2016, 19:06
my approach is the one that bunnuel gave for such types of questions..
total parts to build - 60
total parts 6 build in 1 hour = 6 parts..
so for 6 hours, they build 36 parts
at 6 hour, 1 technician is added.
in hour 7, 7 parts were built. so 36+7 = 43
in hour 8, another technician is added, so built 8 parts = 43+8=51.
in hour 9, another technician is added, so built 9 parts = 51+9=60 - total number of parts.

so it takes 9 hours co complete
if they start at 11AM, then they will finish at 20:00 or 8PM.
Intern
Intern
User avatar
Joined: 14 Dec 2015
Posts: 22
Schools: LBS '17, ISB '17
Followers: 0

Kudos [?]: 1 [0], given: 17

It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 19 Apr 2016, 00:19
total time needed o finish= 6 peeps * 10 hours = 60 hours

6 workers working together ---> starting from 11am to 5pm i.e., 6 hours = 6*6 = 36 hours work done

remaining = 24 hours work
7 hours work in 1st hour
8 in 2nd hr
9 in 3rd hr
-------------
24 in 3hrs --> 5pm + 3hrs --> 8pm
-------------
_________________

"You either DO or DO NOT, there is NO try" - Yoda

Expert Post
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Joined: 02 Aug 2009
Posts: 3165
Followers: 170

Kudos [?]: 1663 [0], given: 75

Re: It takes 6 technicians a total of 10 hours to build and [#permalink]

Show Tags

New post 20 Apr 2016, 00:26
Expert's post
Bunuel wrote:
Bumping for review and further discussion*. Get a kudos point for an alternative solution!

*New project from GMAT Club!!! Check HERE

Theory on work/rate problems: work-word-problems-made-easy-87357.html
All DS work/rate problems to practice: search.php?search_id=tag&tag_id=46
All PS work/rate problems to practice: search.php?search_id=tag&tag_id=66


Hi,
another method, though not easy and as simple as man-hours is--

in 6 hours, \(\frac{6}{10}\)work is completed...
left is \(\frac{4}{10}\)..
1 hour work of 6 is \(\frac{1}{10}\)...
and 1 hr work of 1 is\(\frac{1}{60}\)..
so from 5 pm onwards an AP can be formed..
\(\frac{1}{10} + \frac{1}{60} + \frac{1}{10}+\frac{2}{60} +\)...
let the hour required be x..
then\(\frac{1}{10}+\frac{1}{60} +\frac{1}{10} +\frac{2}{60}+.... \frac{1}{10} + \frac{x}{60}= 1-\frac{6}{10}\)
\(\frac{x}{10} + \frac{1}{60} ( 1+2+..+x) = \frac{4}{10}\)..
\(\frac{x}{10} + \frac{1}{60}*\frac{x(x+1)}{2}=\frac{4}{10}\)..
\(12x + x^2 + x = 48\)..
\(x^2 + 13x -48 =0\)..
\(x^2 + 16x - 3x -48 =0\)..
\((x+16)(x-3) =0\)..
so x=3 ..
time = \(5+3=8pm\)
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Re: It takes 6 technicians a total of 10 hours to build and   [#permalink] 20 Apr 2016, 00:26
    Similar topics Author Replies Last post
Similar
Topics:
5 Experts publish their posts in the topic It takes 6 beavers 10 hours to build a certain dam, working at a unifo Bunuel 6 18 Nov 2015, 01:45
12 Experts publish their posts in the topic Machine A takes 10 hours to complete a certain job and starts that job Bunuel 8 23 Sep 2015, 22:32
7 Experts publish their posts in the topic It takes Abby a hours to build a birdhouse. When Becky and Caroline he Bunuel 5 31 Aug 2015, 10:47
11 Experts publish their posts in the topic John takes 15 hours to complete a certain job, while Bill takes only 6 Bunuel 12 19 Jun 2015, 02:39
13 Experts publish their posts in the topic If it takes 6 identical printing presses exactly 4 hours to piyushksharma 15 10 May 2012, 05:14
Display posts from previous: Sort by

It takes 6 technicians a total of 10 hours to build and

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.