Discussion

Question:

A man goes to a place at the rate of 8 km/h. He comes back on a bicycle at 32 km/h. His average speed for the entire journey is:

Explanation:

Distance is same while going and coming back.

Average speed = $\frac{2 D}{\frac{D}{8} + \frac{D}{32}} = \frac{2 \times 8 \times 32}{8 + 32} = \frac{64}{5}$ km/h = 12.8 km/h

Hence, option (b).

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