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1. |
Pipes A and B, when working together, can fill an empty tank in 8 hours. If B is stopped after 2 hours, it will take a total of 11 hrs to fill the tank. How long would it take A to fill the empty tank alone?_x005F_x000D_ |
A. | 15 hrs |
B. | 12 hrs |
C. | 13 hrs |
D. | 16 hrs |
Answer» C. 13 hrs | |