A tank has three pipes. Pipe A can fill it in 20 hours, Pipe B can fill it in 30 hours, and Pipe C can empty it in 15 hours. If all three pipes are opened for 5 hours, and then Pipe C is closed, how much more time will Pipes A and B take to fill the rest of the tank?

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A tank has three pipes. Pipe A can fill it in 20 hours,... | Mathematics MCQ #29 | Examora | Examora