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

 It is currently 08 Oct 2015, 08:20

# Happening Now:

Interview Invitations for Harvard R1 Applicants | Join GMAT Club Chat Room to live updates

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# facing problem with these types of questions.

Author Message
TAGS:
Intern
Joined: 28 Dec 2009
Posts: 6
Followers: 0

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

facing problem with these types of questions. [#permalink]  30 Dec 2009, 00:46
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:33) wrong based on 1 sessions
If ‘A’ can complete a task in 3 hours and ‘B’ can complete the same task in 6 hours, how long will it take if both of them work together to complete the task?

Thanks

Last edited by david01 on 08 Mar 2010, 01:55, edited 1 time in total.
Manager
Joined: 09 May 2009
Posts: 202
Followers: 1

Kudos [?]: 151 [0], given: 13

Re: I am facing problem with these types of questions. [#permalink]  30 Dec 2009, 02:06
first thing david
the problem never asked about the mean time , the problem is asking how much time it will if bth does the work together . there is a huge diff in bth the cases.

secondly there is a direct formula to handle such problem

if A takes x hrs and B takes y hrs to do a work independently then , combining they will
take x*y/(x+y) hrs

in this case----> 3*6/(3+6)=18/9=2
_________________

GMAT is not a game for losers , and the moment u decide to appear for it u are no more a loser........ITS A BRAIN GAME

Senior Manager
Joined: 22 Dec 2009
Posts: 363
Followers: 11

Kudos [?]: 274 [0], given: 47

Re: I am facing problem with these types of questions. [#permalink]  01 Jan 2010, 10:22
The best approach to these problems is to get the 1 hr work done by each participant.

To explain:
If ‘A’ can complete a task in 3 hours and ‘B’ can complete the same task in 6 hours, how long will it take if both of them work together to complete the task?

In 1 hr, A can do $$=\frac{1}{3}$$ Task

Similarly
In 6 hrs, B can do = 1 Task
In 1 hr, B can do $$=\frac{1}{6}$$ Task

Therefore the task done by both A and B in 1 hr $$=\frac{1}{3} + \frac{1}{6} = \frac{1}{2}$$ Task

Now $$\frac{1}{2}$$ Task is done by both A & B in = 1 hr
1 Task (read as complete Task) is done by both A & B in $$= 1 / \frac{1}{2}$$ hrs = 2 hrs

Reason for this detail approach is that with this understanding you can solve questions involving more than 2 people and also with complex combinations....

Hope this helps!

Cheers!
JT
_________________

Cheers!
JT...........
If u like my post..... payback in Kudos!!

|For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|

~~Better Burn Out... Than Fade Away~~

Re: I am facing problem with these types of questions.   [#permalink] 01 Jan 2010, 10:22
Similar topics Replies Last post
Similar
Topics:
Problem I am facing in GMAT 2 24 Aug 2011, 10:29
What is fastest way to solve this type of problem 2 15 Oct 2010, 23:23
3 Work Problem - Trap Question 4 26 Apr 2010, 11:45
2 Probability Question Problem1 4 26 Mar 2010, 23:18
What is the quickest way to approach this type of question? 2 22 Mar 2010, 07:22
Display posts from previous: Sort by