a boy walks to his school at a distance of 6 km with a constant speed of 2.5 kilometres per hour and walks back with a constant speed of 4 kilometre per hour is average speed for round trip expressed in kilometre per hour
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Distance travelled in first interval = 6km
Speed=2.5km
time = 6/2.5=2.4 h
t2 = 6/4=1.5
Total time =2.4+1.5= 3.9 h
avg speed = 12/3.9=3.0769 kph
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