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1. |
Pipes A and B can fill a tank in 6 hours and 8 hours respectively and pipe C can empty the full tank in 12 hours. All three pipes are opened together, but pipe A is closed after 3 hours. In how many hours will the remaining part of the tank be filled? |
A. | 10 |
B. | 11 |
C. | 12 |
D. | 9 |
Answer» E. | |