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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asked Feb 27, 2017 84.3k views

5 votes

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?

Mathematics
high-school

ZestyZest asked

by ZestyZest

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1 Answer

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s = small pump flowrate = 1 / 70

L = large pump flowrate = 1/30

(1/70 + 1/30) *t = 1

10/210 t = 1

t = 21

Hope this helps

Gabe Thorns answered Mar 5, 2017

by Gabe Thorns

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