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Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?

8 (5/13) hrs
8 (4/13) hrs
7 (4/13) hrs
8 (6/13) hrs

Correct Answer: 8 (4/13) hrs

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