A tank is normally filled in 4 hours. But it takes 5 hours to fill, when there is a leak at the bottom of the tank.If the tank is full, in how many hours can it be emptied by the leak?

A tank is normally filled in 4 hours. But it takes 5 hours to fill, wh

1.	A tank is normally filled in 4 hours. But it takes 5 hours to fill, when there is a leak at the bottom of the tank.If the tank is full, in how many hours can it be emptied by the leak?
A.	12
B.	20
C.	10
D.	15
Answer» C. 10

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A tank is normally filled in 4 hours. But it takes 5 hours to fill, when there is a leak at the bottom of the tank.If the tank is full, in how many hours can it be emptied by the leak?

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