a bus travels a distance of 120 km with a speed of 40km/h and returns with a speed of 40km/h.calculate the average speed for the entire journey.
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Answer:
case-1
D = 120 km
s = 40km/h
t = D/s
= 120/40
= 3 h
case-2
s = 40 km/h
D =120 km
t = D/s
= 120/40
= 3 h
total distance = 240 km
total time = 6 h
average speed = total distance/total time
= 240/6
= 40 km/h
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