A pipe can fill a cistern in 20 minutes, but an outlet can empty it in 28 minutes. When both the pipes are opened, in what time is the cistern filled?

A pipe can fill a cistern in 20 minutes, but an outlet can empty it in

1.	A pipe can fill a cistern in 20 minutes, but an outlet can empty it in 28 minutes. When both the pipes are opened, in what time is the cistern filled?
A.	96 minutes
B.	72 minutes
C.	56 minutes
D.	70 minutes
Answer» E.

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A pipe can fill a cistern in 20 minutes, but an outlet can empty it in 28 minutes. When both the pipes are opened, in what time is the cistern filled?

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