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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

16 Oct 2011, 09:55

4

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

75% (hard)

Question Stats:

47% (01:19) correct 53% (01:34) wrong based on 123 sessions

HideShow timer Statistics

One pump drains one-half of a pond in 3 hours, and then a second pump starts draining the pond. The two pumps working together finish emptying the pond in one-half hour. How long would it take the second pump to drain the pond if it had to do the job alone?

A. 1 hour B. 1.2 hour C. 3 hours D. 5 hours E. 6 hours

Re: One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

16 Oct 2011, 10:56

saumzi wrote:

i know its terribly easy but still i m stuck somewhere...

One pump drains one-half of a pond in 3 hours, and then a second pump starts draining the pond.The two pumps working together finish emptying the pond in one-half hour.How long would it take the second pump to drain the pond if it had to do the job alone???

A.1 hour B.1.2 hour C.3 hours D.5 hours E.6 hours

Can you please check the question? I am getting the answer which is not in option.

Pump 1 drains half of the pond in 3 hrs ==>it will take 6hrs for Pump 1 to drain the entire pond. Number of hrs taken by pump 2 = Y If both pumps working together will empty the pond in 1.5hrs==>3/2 ==>1/6 + 1/Y = 2/3 ==>1/Y = 2/3-1/6 ==>(4-1)/6 =1/2 Y =2 Number of hrs taken by Pump 2 to drain the entire pond = 2hrs
_________________

Re: One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

27 Jan 2016, 10:17

1

This post received KUDOS

saumzi wrote:

i know its terribly easy but still i m stuck somewhere...

One pump drains one-half of a pond in 3 hours, and then a second pump starts draining the pond.The two pumps working together finish emptying the pond in one-half hour.How long would it take the second pump to drain the pond if it had to do the job alone???

A.1 hour B.1.2 hour C.3 hours D.5 hours E.6 hours

The tricky part here, I believed is one half hour = 1/2. Then everything would be easy.

We have the 1st pump working rate/hour = 1/2 : 3 = 1/6 Working rate of 2 pumps: 1/2 : 1/2 = 1. Working rate of 2nd pump: 1 -1/6 = 5/6 --> Time taken for the 2nd pump to finish: 1 : 5/6 = 6/5 = 1.2 hours. Hope it help
_________________

Never forget what you are fighting for... and when your mind and your body tell you to quit. Your heart will tell you to fight.

Re: One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

27 Jan 2016, 20:04

First pump drains 1/2 of the tank in 3 hours so 6 hours it will take to drain the full tank. Let, 2nd pump drains the full tank in a hours so both together can drain (1/6+1/a) part in 1 hour son in 1/2 hour they drain 1/2*(1/6+1/a) part of the tank given that in 1/2 hour they drain 1/2 of the tank hence we can say 1/2*(1/6+1/a) = 1/2 solving u get a = 6/5=1.2 Hence answer is B
_________________

The Mind ~ Muscle Connection My GMAT Journey is Complete.Going to start the MBA in Information Management from 2016 Good Luck everyone.

One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

17 Feb 2016, 15:48

if pump 1 drains 1/12 of pond in 1/2 hour, then pump 2 must drain 1/2-1/12=5/12 of pond in 1/2 hour let t=pump 2's time to drain entire pond alone (5/12)/(1/2))=1/t t=1.2 hours

Re: One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

13 Aug 2017, 18:57

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.
_________________

Re: One pump drains one-half of a pond in 3 hours, and then a second pump [#permalink]

Show Tags

13 Aug 2017, 19:48

Let the total capacity of pond be 6. Pump 1 drains 3 in 3 hrs, i.e. 1 per hour both pumps finishes draining remaining 3 in 0.5 hour, i.e 6 per hour Thus rate of pump 2 has to be (total rate - rate of pump 1) = (6-1) = 5 per hour Pump 2 needs to drain complete 6 @ 5 per hour so time taken is \(\frac{6}{5}\) = 1.2 hrs
_________________

Abhishek Parikh Math Tutor Whatsapp- +919983944321 Mobile- +971568653827 Website: http://www.holamaven.com