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What is the rate, in cubic feet per minute, at which water

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What is the rate, in cubic feet per minute, at which water [#permalink]

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What is the rate, in cubic feet per minute, at which water is flowing into a certain rectangular tank?

(1) The height of the water in the tank is increasing at the rate of 2 feet per minute.
(2) The capacity of the tank is 216 cubic feet.
[Reveal] Spoiler: OA

Kudos [?]: 363 [0], given: 10

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New post 26 Feb 2011, 18:39
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banksy wrote:
What is the rate, in cubic feet per minute, at which water is flowing into a certain rectangular tank?
(1) The height of the water in the tank is increasing at the rate of 2 feet per minute.
(2) The capacity of the tank is 216 cubic feet.


Clear E. Rate=volume/time and even when we combine the statements all we know is one dimension (2 feet) of the volume which flows into the tank per minute (we still need the width and length of the tank to calculate volume=2lw but from the second statement length*width*height=216 we can not get these values).
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Re: What is the rate, in cubic feet per minute, at which water i [#permalink]

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New post 27 Feb 2011, 00:08
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From 1 we have :

2 * l * b/min

From 2 we have :

h * l * b = 216

But we still can't get h ( or l*b), so answer is E.

l - length of base
b - breadth of base
h - height of base
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What is the rate, in cubic feet per minute, at which water [#permalink]

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New post 17 Sep 2017, 08:14
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Hi Bunuel,

Thank you for the explanation.
Just a query.. For this problem, would C be the answer if the tank was cube instead of rectangular?

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Re: What is the rate, in cubic feet per minute, at which water [#permalink]

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New post 17 Sep 2017, 08:28
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Re: What is the rate, in cubic feet per minute, at which water   [#permalink] 17 Sep 2017, 08:28
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