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Correct Answer: 40 h
Let the leak takes x h to empty the tank.
Now. part filled by inlet in 1 h = 1/8
Part filled in 1 h when both tap and leak works together
= 1/8+2 = 1/10
According to the question,
= 1/x = 1/8-1/10=5−4/40 = 1/40
Therefore, x = 40 h