Pipe A can fill a tank in 12 hours, and pipe B can empty it in 18 hours. If both pipes operate together for 4 hours, how long would it take for pipe B alone to empty a volume of water equivalent to the *unfilled* portion of the tank?

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Pipe A can fill a tank in 12 hours, and pipe B can empt... | Mathematics MCQ #17 | Examora | Examora