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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

48 km/hr
24 km/hr
50 km/hr
none of these

Correct Answer: 48 km/hr

Explanation:

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

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