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A motorist travels to a place 150 km away at an average speed of 50 kmh and returns at 30kmh His average speed for the whole journey in km per hour is?
Wiki User
∙ 11y ago
s=vt t=s/v
ATQ
50=150/t
so t=3
and
30=150/t
t=5
avg speed=total distance / total time
so 150+150/5+3
=300/8=37.5=avg speed
Wiki User
∙ 11y ago
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