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Correct Answer: 132 Ltrs.

Let C be the lime that Pipe C takes to empty the tank when Pipe A and Pipe B are closed.

Pipe A + Pipe B – Pipe C kept Open together results in a full tank getting emptied in 1 hour (60 min.)

1/12+1/15−1/C=−1/60 (negative sign indicates that the tank is getting emptied) or 1/12+1/15−1/C=1/C or C=6 minutes

If Pipe C can empty the tank in 6 minutes and it drains water at the rate of 22 liters/minute, then the capacity of the tank = 6×22 = 132 liters.