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# m22 #17

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Director
Joined: 03 Sep 2006
Posts: 871

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09 May 2010, 13:34
Tanks X and Y contain 500 and 200 gallons of water respectively. If water is being pumped out of tank X at a rate of K gallons per minute and water is being added to tank Y at a rate of M gallons per minute, how much time will elapse before the two tanks contain equal amounts of water?
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Joined: 20 Apr 2010
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11 May 2010, 21:11
Say the 2 tanks contain equal amounts of water after T min.

Then water in Tank X after T min = 500 - TK
Then water in Tank Y after T min = 200 + TM

As after T min both contain equal amounts of water .
Therefore , 500 - TK = 200 + TM
or 300 = TK + TM
or 300 = T ( K+M )

T = 300 / ( K+M)
Re: m22 #17   [#permalink] 11 May 2010, 21:11
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# m22 #17

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