Question
A tourist van travels the distance of 35 km from
Dehradun to Mussoorie at an average speed of 36 km/h and returns at 60 km/h. What is the approximate average speed (in km/h) of the tourist van for the entire journey?Solution
x is the speed for the first leg of the journey (36 km/h) y is the speed for the return leg of the journey = (60 km/h) Average Speed =2xy/x+y Average speed = (2×36×60)/ (36+60) Average speed = (120×36)/96 Average speed = 360/8 Average speed = 45 km/h
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