Question
Two inlet pipes P and Q are used to fill a tank. Pipe P fills 25 liters in 5 hours and pipe Q fills 60 liters in 5 hours. Pipe P is kept open for 2 hours and then closed, and pipe Q is opened for the next 1 hour. This process is repeated. If the total capacity of the tank is 264 liters, then find the total time taken to fill the tank.
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