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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 9 hours. Find the time taken by pipe ‘C’ to empty (2/3)th part of the same tank.

A 5 hours

B 7 hours

C 4 hours

D 6 hours

E None of these

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