Question

Pipe A and Pipe B could fill a tank together in 15 hours and 10 hours respectively, while pipe C could empty it in 12 hours. If both inlet pipes are opened together for first 3 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 5 hr 45 min
B 6 hr
C 6 hr 15 min
D 5 hr 30 min
E 7 hr
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