1.

Three faucets P, Q and R can fill a tank in 24, 30 and 40 hours respectively. If P is open all the time and Q and R are open for 2 hours each alternately(start with Q), the tank will be full in?

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Three faucets P, Q and R can fill a tank in 24, 30 and 40 hours respectively. If P is open all the time and Q and R are open for 2 hours each alternately(start with Q), the tank will be full in?




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