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09 May 2010, 13:35
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50% (00:00) correct
50%
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wrong
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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?
A. 5/(m+k)
B. 6(m+k)
C.300/(m+k)
D.300/(m-k)
E. 60/(m-k)
A. 5/(m+k)
B. 6(m+k)
C.300/(m+k)
D.300/(m-k)
E. 60/(m-k)
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09 May 2010, 13:53
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\(500-kt=200+mt\) --> \(mt+kt=300\) --> \(t=\frac{300}{m+k}\), where \(t\) is the time in minutes need.
I think question should specified unit of time, as if question asks how many minutes are needed then the answers would be \(\frac{300}{m+k}\) (C) BUT if question asks how many hours are needed then the answer would be \(\frac{300}{m+k}*\frac{1}{60}=\frac{5}{m+k}\) (A).
Hope it's clear.
22 Aug 2010, 00:04
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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 gallons per minute and water is being added to tank Y at a rate of gallons per minute, how much time will elapse before the two tanks contain equal amounts of water?
A. 5/(m+k)
B. 6(m+k)
C.300/(m+k)
D.300/(m-k)
A. 5/(m+k)
B. 6(m+k)
C.300/(m+k)
D.300/(m-k)
