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Question

A car moves from A to B with a speed of 30kmph and from B to A with a speed of 20kmph. What is the average speed of the car?

A
25kmph
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B
24kmph
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C
50kmph
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D
10kmph
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Solution

The correct option is D 24kmph
The average speed of any moving body is total distance traveled by the body divided by the total time taken to cover that distance.

Let the distance between A to B be x.

Journey from A to B :
Time taken t1=DistanceSpeed=x30 h

Journey from B to A :
Time taken t2=DistanceSpeed=x20 h

Total distance covered in whole journey S=2x
Total time taken t=t1+t2

Average speed vavg=St

vavg=2xx30+x20=2×20×3020+30=24 kmph

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