It is currently 15 Dec 2018, 16:59
My 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.

Working alone, pump A can empty a pool in 3 hours. Working a

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 20 May 2014
Posts: 282
Followers: 15

Kudos [?]: 49 [0], given: 220

CAT Tests
Working alone, pump A can empty a pool in 3 hours. Working a [#permalink] New post 26 Oct 2017, 02:32
00:00

Question Stats:

100% (01:07) correct 0% (00:00) wrong based on 2 sessions
Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

A. 72
B. 75
C. 84
D. 96
E. 108


Kudos for correct solution.
[Reveal] Spoiler: OA
Director
Director
Joined: 03 Sep 2017
Posts: 521
Followers: 1

Kudos [?]: 330 [0], given: 66

Re: Working alone, pump A can empty a pool in 3 hours. Working a [#permalink] New post 26 Oct 2017, 04:39
The combined rate of the two pumps is the sum of their rates, i.e. \(\frac{1}{3}+\frac{1}{2}=\frac{5}{6}\). Then, the minutes needed to empty the pool are \(\frac{6}{5}*60 = 72\) (we multiply by 60 since the rates are in hours).

Answer A
Re: Working alone, pump A can empty a pool in 3 hours. Working a   [#permalink] 26 Oct 2017, 04:39
Display posts from previous: Sort by

Working alone, pump A can empty a pool in 3 hours. Working a

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.