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Question

Two pipes, P and Q, can fill a tank in 60 minutes and 100 minutes, respectively. A third pipe R can empty it in 1 hour 40 minutes. Initially, pipes P and R are opened. After 30 minutes, pipe Q is also opened. How long will it take to completely fill the tank?

A 75 mins

B 27 mins

C 78 mins

D 65 mins

E None of these

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NICL AO

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