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Pipe A and Pipe B could fill a tank together in 40 hours and 16 hours respectively, while pipe C could empty it in 20 hours. If both inlet pipes are opened together for first 4 hours, then pipe C replaced them. Find the time taken by pipe C to empty the tank filled by pipe A and pipe B together.

A 6 hr 45 min

B 7 hr

C 6 hr 30 min

D 5 hr 40 min

E 7 hr 15 min

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