A man travels a distance of a 15km at uniform speed of 30km/hr the next 75km at a uniform speed of 50km/hr and last 10km at a uniform speed of 20km/hr calculate the average speed of the whole journey
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Explanation:
Average speed = total distance / total time
= 15+75+10/30+90+30
=100km/150min
= 100km/2.5hr.
= 40km/h
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