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Pipe ‘A’ and pipe ‘B’, together can fill 40% of a tank in 6 hours while pipe ‘C’ takes 35 hours to empty it. Pipe ‘A’ and pipe ‘B’ were opened together. After 12 hours, pipe ‘C’ is also opened. Find the total time taken to fill the empty tank this way.

A 12.5hours

B 17.25hours

C 8.4hours

D 14.5hours

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