A boy covers a distance AB of 2km with speed of 2.5km/hr, while going from A to B and comes back from B to A with speed 0.5km/hr, his average speed will be
A
1.5km/hr
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B
0.83km/hr
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C
1.2km/hr
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D
3km/hr
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Solution
The correct option is B0.83km/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=0.83km/hr