3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a

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Question: 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?

Options are:

A.     9
B.     10
C.     11
D.     12

Correct answer is:

D.     12