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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 in 24 minutes, while pipe C can empty it in 12 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 12 min

B 16 min

C 20 min

D 24 min

E 28 min

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