As part of his journey, a person travels 120 km at 80 km/h, the next 100 km at 40 km/h,and comes....
As part of his journey, a person travels 120 km at 80 km/h, the next 100 km at 40 km/h, and comes back to the starting point at 75 km/h. The average speed of the person throughout the journey (approximately) is
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