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A tank can be ﬁlled in 9 hours. Because of a leak, it takes 10 hours to ﬁll. In how much time will the leak alone empty the full tank?

Question

A tank can be ﬁlled in 9 hours. Because of a leak, it takes 10 hours to ﬁll. In how much time will the leak alone empty the full tank?

80 hours

Solution

then efﬁciency of hole (Leakage) = 9 – 10 = (-1)
Therefore the leak alone empty the full tank in 90/1 = 90 hours

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