Distance between 2 station a and b 778 km a train covers a journey from a to b at 84 km per hour and return back to a with a uniform speed of 56 km per hour find the average speed of the train during the whole journey
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When distance is same average speed=2v1v2/v1+V2 =2*84*56/84+56=9408/140=67.2km/h
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