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Question

A boy ran from his house to school at a speed of 10 km/h while returning his Speed was 20 km/h what is the average speed of the boy for round trip

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Solution

Dear Student
Average Speed =Total DistanceTotal timeLet distance between house and school is dWhen going from house to school time taken is t1 =d10When going from scholl to house time taken is t2 =d20Average Speed =2d t1+ t2 =2dd10+d20Average Speed =2d2d+d20 =2d3d20 =23×20=13.33 Km/h
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