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castortr0y [4]
4 years ago
11

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
1 answer:
Elodia [21]4 years ago
6 0
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
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