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Original Question
One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 7 days. How long will it take the 2 pumps, wor...Asked by jess
One pump can empty a pool in 4 days, whereas a second pump can empty the pool in 12 days. How long will it take the two pumps, working together, to empty the pool?
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Answered by
oobleck
1/4 + 1/12 = 1/x
looks like it will take 3 days
looks like it will take 3 days
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