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## Water & Pipes

This topic has 1 member reply
smclean23 Master | Next Rank: 500 Posts
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#### Water & Pipes

Sat Aug 16, 2008 3:26 pm
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 2.5 minutes.

Answer is B.....why wouldn't you need to know the amount of water already in the tank.

klamation Junior | Next Rank: 30 Posts
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Sat Aug 16, 2008 3:38 pm
Because the question doesn't ask that, it just asks for the rate the water is increasing per minute. 10 gallons are flowing in per minute and 4 gallons (10 gal. / 2.5 min) are flowing out per minute = net inflow of 6 gallons per minute. This answers the question. It doesn't matter how much water is already in the tank.

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