A truck travels 1/3 of the distance on a straight road with a velocity of 10 km/h, the next 1/3 with a velocity of 20 km/h and last 1/3 with a velocity of 60 km/h. What is the average velocity of the truck for the whole journey?
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Average = total distance /total time =
Total time = d/3(1/20+1/20+1/60)=d/3*(4/60)=d/45
Ave velocity = 45km/h
Total time = d/3(1/20+1/20+1/60)=d/3*(4/60)=d/45
Ave velocity = 45km/h
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