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A pipe can fill a cistern in 20 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?

/ Mathematics Mcqs, Pipes and Cisterns / By
A pipe can fill a cistern in 20 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?

A. 60 min
B. 80 min
C. 70 min
D. 48 min
Explanation:
1/20 – 1/28 = 1/70
70 minutes