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22 December, 23:24

One inlet pipe can fill an empty pool in 6 hours, and a drain can empty the pool in 9 hours. how long will it take the pipe to fill the pool if the drain is left open?

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  1. 22 December, 23:41
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    Inlet pipe can fill the pool in 6 hours, means: every hour the pool is filled 1/6

    a drain can empty the pool in 9 hours, means: every hour the pool is drained 1/9

    If the inlet and the drain are both left open, every hour the pool is filled 1/6-1/9=1/18

    It will take 18 hours to fill up the pool.
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