Question

Pipe A and Pipe B could fill a tank together in 25 hours and 20 hours respectively, while pipe C could empty it in 10 hours. If both inlet pipes are opened together for first 2 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 1 hr 36 min
B 1 hr 42 min
C 1 hr 48 min
D 2 hr
E 1 hr 30 min
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