einstein goes from ahmedabad to lucknow at the speed of 40 km/hr and returned

Question

einstein goes from ahmedabad to lucknow at the speed of 40 km/hr and returned at the speed of 60 km/hr .the average speed of einstein during the whole journey is

Options:

A . 34 km/hr

B . 36 km/hr

C . 42 km/hr

D . 48 km/hr

Answer: Option D
Explanation :

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