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Question

A boy covers a distance AB of 2 km with speed of 2.5 km/hr, while going from A to B and comes back from B to A with speed 0.5 km/hr, his average speed will be

A
1.5 km/hr
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B
0.83 km/hr
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C
1.2 km/hr
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D
3 km/hr
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Solution

The correct option is B 0.83 km/hr
As boy goes from A to B and then comes back from B to A, hence his average speed
vav=2v1v2v1+v2=2×2.5×0.52.5+0.5=2.53=0.83 km/hr

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