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1. |
Pipe A can fill a tank in 4 hours and pipe B can fill the same tank in 3 hours. Pipe C can empty the same full tank in 2 hours. If all the pipes are opened together, then what portion of the tank will be filled after 6 hours? |
A. | 2/9 |
B. | 1/2 |
C. | 1/3 |
D. | 2/3 |
Answer» C. 1/3 | |