A pipe can fill a tank in 20 h. Due to a leak in the bottom, it is filled in 40 h. If the tank is full, how much time will the leak take to empty it ?

A pipe can fill a tank in 20 h. Due to a leak in the bottom, it is fil

1.	A pipe can fill a tank in 20 h. Due to a leak in the bottom, it is filled in 40 h. If the tank is full, how much time will the leak take to empty it ?
A.	40 h
B.	30 h
C.	50 h
D.	30 h
Answer» B. 30 h

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A pipe can fill a tank in 20 h. Due to a leak in the bottom, it is filled in 40 h. If the tank is full, how much time will the leak take to empty it ?

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