Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in ?

– by 0

A. 2 8/11 hours
B. 4 1/2 hours
C. 1 13/17 hours
D. 3 9/17 hours

Explanation:

Net part filled in 1 hour = 1/5 + 1/6 – 1/12 = 17/60

The tank will be full in 60/17 hrs, i.e., 3 9/17 hrs.

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