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1. |
Pipes A, B, and C are attached to an empty cistern. While the first two can fill the cistern in 4 and 10 hours, respectively, the third can drain the cistern, when filled, in 6 hours. If all the three pipes are opened simultaneously when the cistern is three-fifth full, how many hours will be needed to fill the cistern? |
A. | 36/11 |
B. | 48/11 |
C. | 60/11 |
D. | 44524 |
Answer» E. | |