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OpenStudy (anonymous):
Suppose that a small pump can empty a swimming pool in 70 hours and that a large pump can empty a pool in 30. Working together, how long will it take to empty the pool?
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OpenStudy (anonymous):
Is it 21?
OpenStudy (anonymous):
Set it up the same way as the other one. S = small pump flowrate = 1/70 L = large pump flowrate = 1/30 (1/70 + 1/30)*t = 1 solve for t
OpenStudy (anonymous):
Yes! =D 21
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