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To fill the tank Pipe A and Pipe B takes...

To fill the tank Pipe A and Pipe B takes 12hours. Pipe B and Pipe C takes 9 hours to fill the tank and Pipe C and Pipe A together take 15 hours to fill the tank. Find the time taken to fill the tank when Pipe A, Pipe B and Pipe C opened together(approximately).

A

5 hours

B

8 hours

C

9 hours

D

11 hours

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