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1. |
A pipe can fill a tank in 72 minutes. But there is a leak in the bottom of the tank due to which the tank is filled in 18 minutes more. Find in how many hours the leak can empty a full tank ? |
A. | 7 hrs |
B. | 6.5 hrs |
C. | 9 hrs |
D. | 6 hrs |
Answer» E. | |