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Question

A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns with a speed of 20 km/h. Find its average speed.

A
5 km/h
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B
0 km/h
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C
25 km/h
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D
24 km/h
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Solution

The correct option is C 24 km/h
Let the Distance between A and B be x
Time taken from A to B, t1=x30
Time taken from B to A, t2=x20
Total time =t1+t1=x30+x20=5x60
Average speed =total distancetotal time=x+x5x60=2x5x60=24 kmh1

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