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P, Q and R three pipes connected to a tank. P and Q together fill the tank in 30 hours, Q and R together fill the tank in 40 hours. P and R together fill the tank in 60 hours. In how much time will P, Q and R fill the tank separately?

A 80, 60, 120

B 60, 120, 240

C 80, 48, 240

D 80, 60, 240

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