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Arithmetic Ability
Chain Rule

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Q.

3 pumps working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

View Answer

Correct choice: D

Explanation:

Let the required no of working hours per day be x. More pumps , Less working hours per day (Indirect Proportion) Less days, More working hours per day (Indirect Proportion) Pumps 4 : 3} Days 1 : 2}⋮⋮ 8:x => (4 * 1 * x) = (3 * 2 * 8) => x=12
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