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A pool which was 2/3 full to begin with, was

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A pool which was 2/3 full to begin with, was [#permalink]

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New post 07 Nov 2008, 06:47
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

good quistion:

A pool which was 2/3 full to begin with, was filled at a constant rate for (1 2/3) hours until it was 6/7 full. At this rate, how much time would it take to completely fill this pool if it was empty to begin with?

8 hours 45 minutes
9 hours
9 hours 30 minutes
11 hours 40 minutes
15 hours 30 minutes
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Re: Pool quistion [#permalink]

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New post 07 Nov 2008, 07:14
abohassan wrote:
good quistion:

A pool which was 2/3 full to begin with, was filled at a constant rate for (1 2/3) hours until it was 6/7 full. At this rate, how much time would it take to completely fill this pool if it was empty to begin with?

8 hours 45 minutes
9 hours
9 hours 30 minutes
11 hours 40 minutes
15 hours 30 minutes

Hi,
(6/7-2/3)full is filled in 5/3 hours
So 4/21 full is filled in 5/3 hours
So the filling rate is:
4/21 / (5/3) = 4/35
So the pool is filled completely in:
1/ (4/35) = 35/4 hours
A is my answer

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Re: Pool quistion   [#permalink] 07 Nov 2008, 07:14
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A pool which was 2/3 full to begin with, was

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