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1. |
An electric pump can fill a tank in 3 hours. Because of a leak in the tank, it took 3 hours 30 min to fill the tank. In what time the leak can drain out all the water of the tank and will make tank empty ? |
A. | 10 hours |
B. | 13 hours |
C. | 17 hours |
D. | 21 hours |
Answer» E. | |