Pipes A and B can fill a tank in 5 and 6 hoursrespectively. Pipe C can – InterviewSolution

1.	Pipes A and B can fill a tank in 5 and 6 hoursrespectively. Pipe C can empty it in 12 hoursThe tank is half full. All the three pipes are inoperation simultaneously. After how much timewill the tank will be full.
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