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Two inlet pipes can fill a tank in 6 and 8 hours respectively. An outlet pipe can empty it in 12 hours. How long will the tank take to fill if all pipes are opened?

Correct Answer: 6 hours

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Math MCQ: Two inlet pipes can fill a tank in 6 and 8 hours respectively. An outlet pipe can empty it in 12 hours. How long will the tank take to fill if all pipes are opened? | Extra Education