A tank is filled in 3 hours by three pipes A, B and C. Pipe A is 6 times as fast as pipe C and 2 times as fast as pipe B. How many hours will pipes B and C take to fill the tank?

1
\(7\frac{4}{5}\)
2
7
3
\(7\frac{1}{4}\)
4
\(7\frac{1}{2}\)

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