1.

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

Answer»

48 km/hr
24 km/hr
50 km/hr
None of the above

Solution :`(2xx40xx60)/(40+60)`=4800/100=48 km/hr
so the AVERAGE SPEED =40+(2/5)20=48km/hr


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