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Water is pumped into a partially filled tank at a constant

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Senior Manager
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Joined: 10 Nov 2010
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Location: India
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Water is pumped into a partially filled tank at a constant [#permalink] New post 21 Feb 2011, 03:53
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78% (01:19) correct 22% (00:21) wrong based on 89 sessions
Water is pumped into a partially filled tank at a constant rate through an inlet pipe. At the same time, water is pumped out of the tank at a constant rate through an outlet pipe. At what rate, in gallons per minute, is the amount of water in the tank increasing?

(1) The amount of water initially in the tank is 200 gallons.
(2) Water is pumped into the tank at a rate of 10 gallons per minute and out of the tank at a rate of 10 gallons every 2\frac{1}{2} minutes.

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Re: pump in pump out [#permalink] New post 21 Feb 2011, 04:13
I agree with solution B. Since water is being pumped into the tank at the rate of 10 gallon per minute and out at the rate of 4 gallon (calculation: 10*2/5) per minute the water level increases at the rate of 6 gallon per minute.

However, as you were able to derive the answer yourself (and included the solution), I'm not quite sure why you posted the question.
Re: pump in pump out   [#permalink] 21 Feb 2011, 04:13
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Water is pumped into a partially filled tank at a constant

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