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5 March, 11:59

If a pump can fill a pool within 6 hours, and another pump can empty the pool within 3 hours, how long will it take the pool to empty when it's full and when both pumps are working?

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  1. 5 March, 12:01
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    6 hours

    Step-by-step explanation:

    Pump 1 velocity = 1 pool / 6 hours = 1/6 [pool/hour]

    Pump 2 velocity = 1 pool / 3 hours = 1/3 [pool/hour]

    Assuming two pumps are running the resultant velocity = 1/3 - 1/6 = 1/6 [pool/hour]

    So it will take 6 hours
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