8. A pipe can fill a cistern in 16 hours. Due to a leakage at the bottom of the cistern, it is filled in 20 hours
When the cistern is full, in how much time will it be emptied by the leakage?
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Step-by-step explanation:let leakage= B
A's 1 hour work=1/16
(A+B)'s 1 hour work =1/20
B's 1 hour work=A's 1 hour work-(A+B)'s 1 hour work
=1/16-1/20=(5-4)/80=1/80
so,cistern will be emptied by B(leakage) in 80 hours
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