Arithmetic Ability
Time and Work

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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?
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Correct choice:

Explanation:

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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