Question
Pipes ‘A’ and ‘B’ can fill a tank in 6 hours and 8 hours, respectively and pipe ‘C’ can empty the full tank in 12 hours. All three pipes are opened together, but after 2 hours pipe ‘B’ is closed while pipes ‘A’ and ‘C’ are opened until the tank is full. How many hours will the empty tank be filled this way?
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