Distance between two stations A and B is 1108 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 train during the whole journey.

60 km/hr

30.5 km/hr

57 km/hr

67.2 km/hr

Average speed = (2xy)/(x+y) km/hr = (2×84×56)/(84+56) km/hr = (2×84×56)/140 km/hr = 67.2 km/hr.

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