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A boy covers a distance AB of 2 km with ...

A boy covers a distance AB of 2 km with speed of 2.5 km/h, 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

B

0.83 km/hr

C

1.2 km/hr

D

3 km/hr

Text Solution

Verified by Experts

As boy goes from A to B and then comes back from B to A hence his average speed
`v_(av) = (2v_(2) v_(2))/(v_(1) + v_(2)) = (2xx 2.5 xx0.5)/(2.5 + 0.5) = (2.5)/(3) = 0.8 ` km/hr
Hence correct answer is (B)
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