A man goes uphill with an average speed of 35 km/hr, and

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A man goes uphill with an average speed of 35 km/hr, and covers down with an average speed of 45 km/hr. The distance travelled in both the cases being the same , the average speed for the entire journey is ?

1. 38 ³/₈ km/hr.
2. 39 ³/₈ km/hr.
3. 40 km/hr
4. None of these

Correct Option: B

Average speed = 2uv / (u + v)
= ( 2 x 35 x 45) / (35 + 45) km/hr.
= 39 ³/₈ km/hr