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Question

Pipes 'P' and 'Q' can fill a tank in 36 minutes and 72 minutes respectively. A third pipe 'R' can empty it in 1 hour 48 minutes. 'P' and 'R' are turned on together. After 30 minutes, 'Q' is also started. Find how long in total it takes to fill the tank.

A 75 mins

B 27 mins

C 46 mins

D 65 mins

E None of these

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