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

Solution

Total work = 3 × 8 × 2 = 48 pump-hours. If 4 pumps must finish in 1 day, let required hours be h. Then 4 × h × 1 = 48, so h = 12 hours.

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