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If pipe B fills a container at a constant rate in 100 minute

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If pipe B fills a container at a constant rate in 100 minute [#permalink] New post 30 Nov 2012, 20:46
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46% (01:51) correct 53% (00:53) wrong based on 28 sessions
If pipe B fills a container at a constant rate in 100 minutes, how many minutes does it take pipe A, working at is own constant rate, to fill the same container?

(1) Pipe A and pipe B together fill the container at (1/4) the time it takes pipe A alone.
(2) Pipe A and pipe B together fill the container at (3/4) the time it takes pipe B alone.


[Reveal] Spoiler:
I initially chose B because stat(1) gives us information that is relative to an unknown (A) So I wasn't sure how this would be sufficient.

agh, anyone have any insight?
[Reveal] Spoiler: OA
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Re: If pipe B fills a container at a constant rate in 100 minute [#permalink] New post 30 Nov 2012, 21:23
Both are individually sufficient

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Re: If pipe B fills a container at a constant rate in 100 minute [#permalink] New post 30 Nov 2012, 21:40
anon1 wrote:
Agh on a cold streak

If pipe B fills a container at a constant rate in 100 minutes, how many minutes does it take pipe A, working at is own constant rate, to fill the same container?
(1) Pipe A and pipe B together fill the container at (1/4) the time it takes pipe A alone.

(2) Pipe A and pipe B together fill the container at (3/4) the time it takes pipe B alone.


[Reveal] Spoiler:
I initially chose B because stat(1) gives us information that is relative to an unknown (A) So I wasn't sure how this would be sufficient.

agh, anyone have any insight?


For any such question of rate A , rate B and total rate T question remember the relation
1/T = 1/A + 1/B

Now question already gives you B =100
So eventually u have equation
1/T = 1/A + 1/100
And question is asking value of A. Which we can not find because of unknown T.

Now lets look at statements
Statement 1: Together it takes 1/4 time of A. => T = A/4. You just got the relation between A and T. You can surely solve the equation in question with this to get A.
Statement 2: Together it takes 3/4 time of B => T = 3B/4 and you already know B. so you know T. you can again solve the euqation in question with this to get A.

Hence ans D it is !
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Re: If pipe B fills a container at a constant rate in 100 minute [#permalink] New post 02 Dec 2012, 09:19
For any such question of rate A , rate B and total rate T question remember the relation
1/T = 1/A + 1/B

That's right, the Master GMAT system didn't go through that. I better review this....
Re: If pipe B fills a container at a constant rate in 100 minute   [#permalink] 02 Dec 2012, 09:19
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