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Pipe P and Q can fill a tank in 20 minutes and 30 minutes individually. Another pipe R can empty the tank in 60 minutes. When all the three pipes are opened together then What will be the time taken by them to fill 75% of the capacity of the tank.

A 12 minutes

B 12.20 minutes

C 10 minutes

D 11.25 minutes

E none of these

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