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# Water is pumped into a partially filled tank at a constant

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Senior Manager
Joined: 10 Nov 2010
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Location: India
Concentration: Strategy, Operations
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WE: Information Technology (Computer Software)
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Water is pumped into a partially filled tank at a constant [#permalink]  21 Feb 2011, 03:53
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Difficulty:

5% (low)

Question Stats:

74% (01:19) correct 26% (00:18) wrong based on 125 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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Manager
Joined: 02 Apr 2010
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Re: pump in pump out [#permalink]  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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