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A boy walks to his school at a distance of 6 km with constant speed of
2.5 km/hour and walks back with a constant speed of 4 km/hır. His average speed
for round trip expressed in km/hour, is
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Answer 1

Answer:

distance = 6km

speed in 1st case = 2.5km/h

time taken = distance/speed

= 2.4hr

speed in 2nd case = 4km/hr

time taken = 6/4

= 1.5 hr

total time = 3.9 hr

total distance = 12km

average speed = 12/3.9

= 3.08 km/hr or 3km/hr ( approx )

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