Instantaneous water heater
Water flows into and out of an instantaneous water heater at the same time. If water only flows in, the empty water heater would be filled in 18 minutes. If water only flows out, the full water heater would be emptied in 20 minutes. How many hours will it take to fill an empty water heater if the water inlet and outlet are opened at the same time?
Correct answer:
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statisticsarithmeticUnits of physical quantitiesthemes, topicsGrade of the word problem
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