Pipe A and B are filling pipes while C is an emptying pipe. A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty after.
ABA+B+CC 7290120 360(total capacity) 543-6 Efficiency of leak pipe C=3-(5+4) = -6 Work done by pipes A and B in 12 minutes = (5+4) ×12=108 Time taken to empty by pipe C =108/6=18min.
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