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Question

Pipe X can fill a tank in 25 minutes, pipe Y can fill it in 50 minutes, while pipe Z can empty it in 20 minutes. Pipe X is opened first, pipe Y after 5 minutes, and pipe Z after 10 minutes. Find the total time taken to fill the tank.

A 40 min

B 45 min

C 50 min

D 55 min

E 60 min

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