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


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