empty pool

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success1111: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Apr 19, 2009 11:07 pm

by success1111 » Tue May 05, 2009 8:19 pm

A pump started filling an empty pool with water and continued at
a constant rate until the pool was full. At noon the pool was 1/3 full,
and 1+1/4 hours later it was 3/4 full. What was the total number of
hours that it took the pump to fill the pool?

A. 2+1/3
B. 2+2/3
C. 3
D. 3+1/2
E. 3+2/3

i am surprised my answer wasn't there.Am i missing something.

Trust but verify.

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Source: Beat The GMAT — Problem Solving | Tue May 05, 2009 8:19 pm

preetosh: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Thu Apr 30, 2009 7:40 am; Location: Hyderabad

My answer is 3 hrs

by preetosh » Tue May 05, 2009 8:47 pm

Hi

IMO answer is 3 hrs.
Check it and let me know

In 1+1/4 hrs , pool was filled 3/4 -1/3 = 5/12

It means in 5/12 pool is filled in 5/4 hrs
So pool will be completely filled in (5/4) * (12/5) = 3 hrs

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yashanth.ponnanna: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Fri Jun 06, 2008 2:50 am; Thanked: 1 times

by yashanth.ponnanna » Tue May 05, 2009 9:45 pm

Its C

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Pranay: Senior | Next Rank: 100 Posts; Posts: 59; Joined: Tue May 05, 2009 1:58 am; Thanked: 1 times

by Pranay » Wed May 06, 2009 12:16 am

yashanth.ponnanna wrote:Its C

Agree with both of them above ..

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success1111: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Apr 19, 2009 11:07 pm

Re: My answer is 3 hrs

by success1111 » Wed May 06, 2009 4:34 pm

preetosh wrote:Hi

IMO answer is 3 hrs.
Check it and let me know

In 1+1/4 hrs , pool was filled 3/4 -1/3 = 5/12

It means in 5/12 pool is filled in 5/4 hrs
So pool will be completely filled in (5/4) * (12/5) = 3 hrs

Thanks. OA is C.It seems i misintepreted the question.

Trust but verify.

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Jeff@TargetTestPrep: GMAT Instructor; Posts: 1462; Joined: Thu Apr 09, 2015 9:34 amFollowed by: 22 members; Location: New York, NY; Thanked: 39 times

by Jeff@TargetTestPrep » Wed Dec 13, 2017 7:36 am

success1111 wrote:A pump started filling an empty pool with water and continued at
a constant rate until the pool was full. At noon the pool was 1/3 full,
and 1+1/4 hours later it was 3/4 full. What was the total number of
hours that it took the pump to fill the pool?

A. 2+1/3
B. 2+2/3
C. 3
D. 3+1/2
E. 3+2/3

Since it took 1 1/4 = 5/4 hours to fill 3/4 - 1/3 = 9/12 - 4/12 = 5/12 of the pool, we can let x = the number of hours to fill the pool and create a proportion to determine how long it will take to fill the entire pool.

(5/4)/(5/12) = x/1

5/4 = 5x/12

60 = 20x

x = 3

Answer: C

Jeffrey Miller
Head of GMAT Instruction
[email protected]

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

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