Question
A tank has two inlet pipes P and Q. Pipe P can fill 12 liters in 4 hours and pipe Q can fill 30 liters in 5 hours. If P is opened for 2 hours and then closed, after which Q is opened for the next 1 hour and this 3-hour pattern is repeated, then in how much time will the tank of capacity 96 liters be completely filled?
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