3 pumsps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the same tank in 1 day?
A. 9 hours
B. 10 hours
C. 11 hours
D. 12 hours
E. None of these
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সঠিক উত্তরঃ
D.
12 hours
Explanation:
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