Q:
Concept of Nehative Work
A tub can be filed in 20 minutes but there is a lekage in it which can empty the full tub in 60 minutes. In how many minutes it can be filled?
Answer
Filling efficiency = 5%
Emptying efficiency = 1.66%
Net efficiency = 5-1.66 = 3.33%
Therefore, Required time to fil the tub =100/3.33= 30 minutes
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