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Question

Pipe P can fill half of the tank in 8 hrs 5 min and pipe Q can fill the same tank completely in 16 hrs 5 min. Another pipe R can empty the full tank in 12 hrs. If all the pipes are opened together then in how much time 66.66% of the tank is filled?

A 12 hours

B 16 hours

C 18 hours

D 20 hours

E 22 hours

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