1.

A tank is completely filled in 16 hours but takes four hours more to fill because of a leak in the bottom of the bank. What time will the leak take to empty the completely filled tank ?

Answer»

80 hrs



Let the time TAKEN by the leak to empty the FULL tank be x hourse.
So, part of the rank filled in ONE hour is 1/16 - 1/x = x-16/16X
∴ Tank will be filled in 16x/x-16 hourse.
∴ 16x/x-16 = (16 + 4) = 20
∴ 16x = 20x - 320
∴ x = 320/4 = 80 hourse



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