A boy walks to his home at a distance of 6 km with a constant speed of 2.5km/ hr and walks back with a constant speed of 4km/hr. What is the average speed for a round trip in km/hr Please answer this question...
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part 1 of the journy's time
6/2.5 = 0.8hr.
part 2 time = 6/4 = 1.5hr.
0.8 + 1.5 = 2.3hr.
speed = 12/2.3
which is 120/23 km/hr.
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