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working together at their constant rates , A and B can fill

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working together at their constant rates , A and B can fill [#permalink] New post 09 Jun 2010, 06:00
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A
B
C
D
E

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(N/A)

Question Stats:

100% (03:25) correct 0% (00:00) wrong based on 3 sessions
15.working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B?
1) A's constant rate is 25LTS / min
2) the tanks capacity is 1200 lts.


I think the answer is C ( 1and 2 are needed to solve) But i have seen A as the answer. Could sombody pls explain in detail :-D thx!
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Re: Help pls DS rate problem [#permalink] New post 09 Jun 2010, 08:26
A in insufficient. Depending on the size of the tank, you will get different values for the rate of pump B. For instance, if the tank is 50 lts, the rate of B is 75 lts/min. If the tank is 100 lts, the rate of B is 175 lts/min.

The correct answer is C.
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Re: Help pls DS rate problem [#permalink] New post 09 Jun 2010, 10:22
IMO C

as explained above
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Re: Help pls DS rate problem   [#permalink] 09 Jun 2010, 10:22
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working together at their constant rates , A and B can fill

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