Einstein goes from Ahmedabad To Lucknow at the speed of

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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

1. 48 km/hr
2. 24 km/hr
3. 50 km/hr
4. none of these

Correct Option: A

Average speed =2 x 40 x 60 / ( 40+ 60)
= 4800 / 100
= 48 km/hr