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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?

Correct Answer: 12

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)


  P u m p s 4   :   3 D a y s 1   :   2   8 : x


=> (4 * 1 * x) = (3 * 2 * 8)


=> x=12


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