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Question

# A car goes down a certain road at an average speed of 40km/h and returns along the same road at an average speed of 60km/h. Calculate the average speed for the round trip. (in km/h)

A
57
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B
58
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C
48
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D
69
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Solution

## The correct option is D 48For one side trip :Let the distance covered be S.Speed v1=40 km/hTime taken t1=Sv=S40 hFor return trip :The distance covered be SSpeed v2=60 km/hTime taken t2=Sv2=S60 hTotal distance covered =2STotal time taken ttotal=t1+t2=S40+S60So, average speed vavg=2Sttotal⟹ vavg=2SS40+S60=2×40×6040+60=48 km/h

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