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

It is currently 27 Jan 2015, 17:49

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 Computer A 36 hours to process data. If Computer A starts wor

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 18 Jul 2008
Posts: 36
Followers: 0

Kudos [?]: 3 [0], given: 0

It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 07 Aug 2008, 21:31
3
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

65% (02:39) correct 35% (01:58) wrong based on 65 sessions
It takes Computer A 36 hours to process data. If Computer A starts working at 7 pm on Monday and after half the data are processed Computer B, three times as fast as Computer A, joins in the task, when will the data processing be finished?

A. 4:30 pm Tuesday
B. 5:30 pm Tuesday
C. 7:00 pm Tuesday
D. 8:30 pm Tuesday
E. 10:30 pm Tuesday

M18-12
[Reveal] Spoiler: OA
Manager
Manager
User avatar
Joined: 21 Feb 2008
Posts: 70
Followers: 2

Kudos [?]: 31 [0], given: 1

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 07 Aug 2008, 21:40
mba9now wrote:
It would take Computer A 36 hours to process the data. If Computer A starts working at 7 pm on Monday and after half the data is processed Computer B, three times as fast as Computer A, is joined in the task, when will the data processing be finished?


4:30 pm Tuesday
5:30 pm Tuesday
7:00 pm Tuesday
8:30 pm Tuesday
10:30 pm Tuesday


comp A takes 36h and comp B takes 12h

comp A starts at 7pm on monday, processes half the data so it finishes at 7pm+(36/2)h which is 1pm on tuesday. Comp B takes up the next half so it finishes at 1pm+(12/2)h=7pm on Tuesday
_________________

Is this okay?

Intern
Intern
avatar
Joined: 06 Aug 2008
Posts: 2
Followers: 0

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

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 07 Aug 2008, 21:54
The answer is B (5:30 PM Tuesday). Becasue it is said that Comp B joins A, never says only B did the work alone.
1 KUDOS received
SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1828
Location: New York
Followers: 29

Kudos [?]: 508 [1] , given: 5

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 08 Aug 2008, 07:42
1
This post received
KUDOS
1
This post was
BOOKMARKED
mba9now wrote:
It would take Computer A 36 hours to process the data. If Computer A starts working at 7 pm on Monday and after half the data is processed Computer B, three times as fast as Computer A, is joined in the task, when will the data processing be finished?


4:30 pm Tuesday
5:30 pm Tuesday
7:00 pm Tuesday
8:30 pm Tuesday
10:30 pm Tuesday


computer A take 36 hr
computer B takes 12 hr

18 hrs (half job done by computer) + Half job dont by both
= 18 hrs + 18 / (3+1) = 22.5 hrs.

B is the answer
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

1 KUDOS received
VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1405
Followers: 7

Kudos [?]: 138 [1] , given: 0

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 08 Aug 2008, 20:17
1
This post received
KUDOS
mba9now wrote:
It would take Computer A 36 hours to process the data. If Computer A starts working at 7 pm on Monday and after half the data is processed Computer B, three times as fast as Computer A, is joined in the task, when will the data processing be finished?


4:30 pm Tuesday
5:30 pm Tuesday
7:00 pm Tuesday
8:30 pm Tuesday
10:30 pm Tuesday


work done by A in one hr = w/36
by B in 1 hr=w/12
by both in 1 hr=w/12 + w/36=w/9

hence half the work is already done by A in 18 hrs

half the work w/2 is to be done by both hence time talken is w/2/w/9=9/2=4.5 hrs
total time taken is 18+4.5 hrs=22.5 hrs
5.30pm tues is answer
IMO B
_________________

cheers
Its Now Or Never

Senior Manager
Senior Manager
avatar
Joined: 06 Apr 2008
Posts: 451
Followers: 1

Kudos [?]: 57 [0], given: 1

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 08 Aug 2008, 22:07
mba9now wrote:
It would take Computer A 36 hours to process the data. If Computer A starts working at 7 pm on Monday and after half the data is processed Computer B, three times as fast as Computer A, is joined in the task, when will the data processing be finished?


4:30 pm Tuesday
5:30 pm Tuesday
7:00 pm Tuesday
8:30 pm Tuesday
10:30 pm Tuesday


Total hrs = 18 + Hours required to do half job = 18 + (18*6)/24 = 22.5 hrs = 5:30pm Tue
CEO
CEO
User avatar
Joined: 09 Sep 2013
Posts: 3865
Followers: 251

Kudos [?]: 49 [0], given: 0

Premium Member
Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 09 Nov 2014, 11:29
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

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 25308
Followers: 3915

Kudos [?]: 34964 [0], given: 4063

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 10 Nov 2014, 01:38
Expert's post
It takes Computer A 36 hours to process data. If Computer A starts working at 7 pm on Monday and after half the data are processed Computer B, three times as fast as Computer A, joins in the task, when will the data processing be finished?

A. 4:30 pm Tuesday
B. 5:30 pm Tuesday
C. 7:00 pm Tuesday
D. 8:30 pm Tuesday
E. 10:30 pm Tuesday

Computer A will process the first half of the data in 18 hours. Computer A and Computer B working together will process the remaining half four times quicker than will Computer A working alone. The entire task will require 18 + \frac{18}{4} = 22.5 hours which is 1.5 hours short of the 24-hour cycle. If the processing commences at 7 pm on Monday, it will finish at 5:30 pm on Tuesday.

Answer: B.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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?
25 extra-hard Quant Tests

GMAT Club Premium Membership - big benefits and savings

1 KUDOS received
SVP
SVP
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1652
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Followers: 17

Kudos [?]: 668 [1] , given: 190

Re: It takes Computer A 36 hours to process data. If Computer A starts wor [#permalink] New post 12 Nov 2014, 01:25
1
This post received
KUDOS
Rate of Computer A = \frac{1}{36}

Rate of Computer B = \frac{1}{12}

\frac{1}{2} Job completed by Computer A alone; means time consumed by Computer A = \frac{1}{2} * 36 = 18 Hrs

Combined rate of A & B = (\frac{1}{36} + \frac{1}{12}) = \frac{1}{9}

Time required to complete remaining \frac{1}{2} Job = \frac{1}{2} * \frac{9}{1} = 4.5 Hrs

Total Time required to complete job = 18 + 4.5 = 22.5 Hrs

24 Hrs is SAME TIME next day, so 22.5 Hrs would be

7PM Tuesday - 1.5 Hrs = 5:30 PM Tuesday

Answer = B
_________________

Kindly press "+1 Kudos" to appreciate :)

Re: It takes Computer A 36 hours to process data. If Computer A starts wor   [#permalink] 12 Nov 2014, 01:25
    Similar topics Author Replies Last post
Similar
Topics:
4 Computational analyses of data is used for the construction SaraiGMAT 12 13 Jun 2010, 01:31
computer ritula 4 07 Feb 2009, 02:41
A year advantage in a new computer product or process being ayushi 0 13 Oct 2006, 08:41
Elana was working to code protocols for computer processing. cloaked_vessel 4 02 Apr 2005, 10:21
A year advantage in a new computer product or process being Praetorian 0 25 Jun 2008, 15:52
Display posts from previous: Sort by

It takes Computer A 36 hours to process data. If Computer A starts wor

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| 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®.