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Question

Three pipes A, B and C are connected to a reservoir. Pipe A can fill it in 16 minutes, pipe B can fill it in 24 minutes, while pipe C can empty the completely filled reservoir in 48 minutes. Pipe A is opened first, pipe B after 4 minutes, and pipe C after 8 minutes. Find the total time taken to fill the reservoir.

A 16 min

B 20 min

C 24 min

D 28 min

E 12 min

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