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Question

A tank has two pipes, Pipe A and Pipe
B. Pipe A fills the tank in 10 hours, while Pipe B fills it in 15 hours. Pipe C can empty the tank in 30 hours. If all three pipes are opened together, how long will it take to fill the tank?

A 6 hours

B 7.5 hours

C 10 hours

D 12.5 hours

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