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Water is pumped into a partially filled tank at a constant

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Water is pumped into a partially filled tank at a constant [#permalink]

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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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OPEN DISCUSSION OF THIS QUESTION IS HERE: water-is-pumped-into-a-partially-filled-tank-at-a-constant-136881.html
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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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New post 21 Feb 2011, 05:13
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.
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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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Re: Water is pumped into a partially filled tank at a constant [#permalink]

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New post 18 Feb 2016, 01:17
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GMATD11 wrote:
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.

Official Guide 12 Question

GMAT Official Guide 12

Question: 10
Page: 273
Difficulty: 600

Find All Official Guide Questions

Video Explanations:


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. Clearly insufficient.
(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. Since water is pumped out of the tank at a rate of 10 gallons every \(2\frac{1}{2}=\frac{5}{2}\) minutes, then it's pumped out at a rate of \(\frac{10}{(\frac{5}{2})}=4\) gallons per minute, hence the net increase is \(10-4=6\) gallons per minute. Sufficient.

Answer: B.

OPEN DISCUSSION OF THIS QUESTION IS HERE: water-is-pumped-into-a-partially-filled-tank-at-a-constant-136881.html
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Re: Water is pumped into a partially filled tank at a constant   [#permalink] 18 Feb 2016, 01:17
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