Question

A pipe can fill a cistern in 4 hours due to leak in its bottom the cistern fills up in 5 hours. if the cistern is completely filled, in how mach time will it be emptied by leak
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Answer 1

Answer:

A pipe Can Fill in 4 hours work done will be 1/4 Cistern fills up in 5 hours if there is a leak. so work will be done in 1/5

Time taken to empty the cistern

= 1/4-1/5

= 5-4/20

= 1/20