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1. |
Two pipes A and B can fill a tank in 10 hours and 30 hours respectively. Due to a leak in the tank, it takes 2.5 hours more to fill the tank. How much time would the leak alone will take to empty the tank ? |
A. | 20 hours |
B. | 25 hours |
C. | 30 hours |
D. | 35 hours |
Answer» D. 35 hours | |