A tank has inlet pipe which can fill it in 4 minutes. There is also a waste pipe in the tank. When both inlet and waste pipes are opened, the empty tank takes 20 minutes to fill. How long will the waste pipe take to empty the full tank when inlet pipe is closed?

A tank has inlet pipe which can fill it in 4 minutes. There is also a

1.	A tank has inlet pipe which can fill it in 4 minutes. There is also a waste pipe in the tank. When both inlet and waste pipes are opened, the empty tank takes 20 minutes to fill. How long will the waste pipe take to empty the full tank when inlet pipe is closed?
A.	10 minutes
B.	5 minutes
C.	16 minutes
D.	24 minutes
Answer» C. 16 minutes

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A tank has inlet pipe which can fill it in 4 minutes. There is also a waste pipe in the tank. When both inlet and waste pipes are opened, the empty tank takes 20 minutes to fill. How long will the waste pipe take to empty the full tank when inlet pipe is closed?

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