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in Mathematics by (57.4k points)

Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns 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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Best answer

Required average speed = ((2xy)/(x+y)) km / hr 

= (2 x 84 x 56)/(84+56)km/hr 

= (2*84*56)/140 km/hr 

= 67.2 km/hr. 

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