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
Net part filled in 1 hour = (1/5 + 1/6 -1/12)
Therefore, the tank will be full in 60/17 hrs. => 3×9/17 hrs.
Back To Top