Distanc e 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 56km per hour. Find the average speed of the train during the whole journey?

Arithmetic Aptitude

1)	Distanc e 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 56km per hour. Find the average speed of the train during the whole journey?

A) 67.2 km.hr
B) 72.3 km./hr
C) 68.4 km./hr
D) 79.35 km./hr

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