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1. |
Pipes A and B can empty a full tank in 8 and 12 hours, respectively. C is a filling pipe. All the three pipes were opened together at the same time and one-sixth of the tank got emptied in one hour. C alone can fill the tank in: |
A. | 20 hours |
B. | 30 hours |
C. | 24 hours |
D. | 25 hours |
Answer» D. 25 hours | |