Sonia travels to IBA from Uttara by car at a speed of 40 km per hour and returns to Uttara at a speed of 30 km per hour by an auto rickshaw. What is her average speed in the entire journey in km/hour?

A. 35

B. 34.3

C. 37.5

D. 35.3

E. 36

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Explanation: Average speed \(= \frac{2uv}{u+v}\). Here \(u=40 \text{ kmph}\) and \(v=30 \text{ kmph}\). Average speed \(= \frac{2\times40\times30}{40+30} = \frac{2400}{70} \approx 34.3 \text{ kmph}\).

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Sonia travels to IBA from Uttara by car at a speed of 40 km per hour and returns to Uttara at a speed of 30 km per hour by an auto rickshaw. What is her average speed in the entire journey in km/hour?