| View previous topic :: View next topic |
| Author |
Message |
anjaligeorge1
Rising GMAT Star
Joined: 20 Feb 2008
Posts: 62
Thanks given: 1
Thanked 1 times in 1 posts
|
 Posted: Thu Jun 12, 2008 9:40 am Post subject: time and work |
 |
|
Pump X started filling an empty pool with water and continued at a constant rate. 5 hours later, the pool was 1/4 full. Then, pump B joined the work. 9 hours later, the pool was full. Working alone at its constant rate, how long will it take B to fill the empty pool?
(A) 15
(B) 18
(C) 20
(D) 30
(E) 45
answer is D.How do i solve this |
|
| Back to top |
|
 |
|
|
durgesh79
Really wants to Beat The GMAT!
Joined: 22 Apr 2008
Posts: 168
Thanks given: 5
Thanked 12 times in 10 posts
|
| Posted: Thu Jun 12, 2008 9:52 am Post subject: Re: time and work |
|
|
| anjaligeorge1 wrote: | Pump X started filling an empty pool with water and continued at a constant rate. 5 hours later, the pool was 1/4 full. Then, pump B joined the work. 9 hours later, the pool was full. Working alone at its constant rate, how long will it take B to fill the empty pool?
(A) 15
(B) 18
(C) 20
(D) 30
(E) 45
answer is D.How do i solve this |
Pump X fills 1/4 of the Pool in 5 hrs. Means it'll take 4X5=20 hrs for X to fill the total pool alone.
Both X and Y fill 3/4 of the pool in 9 hrs. Mean it'll take 9*4/3 = 12 hrs for both X and Y to fill the total pool.
1/Y + 1/20 = 1/12
Y = 30. Option D |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
|
|
"GMAT" and other GMAC™ trademarks are registered trademarks of the Graduate Management Admission Council™. The Graduate Management Admission Council™ does not endorse, nor is it affiliated in any way with the owner or any content on this website. The opinions expressed here are solely those of the author or those of the members of this website. Copyright © 2009 BTG Test Prep, LLC. Powered by phpBB.
|
|
