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1. |
A pipe can fill a tank in 120 hours. Due to the leak in its bottom, the tank is filled in 150 hours. If the tank is full, then that leak can empty the tank in howmany hours? |
A. | 1000 |
B. | 500 |
C. | 600 |
D. | 1200 |
Answer» D. 1200 | |