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Pipes ‘A’ and ‘B’ can fill a tank in 6 hours and 9 hours, respectively. If pipe ‘C’ is opened along with pipes ‘A’ and ‘B’, then the tank gets filled in 6 hours. Find the time taken by pipe ‘C’ to empty (5/6)th part of the same tank.

A 5.5 hours

B 6.5 hours

C 7.5 hours

D 8.5 hours

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