A goes from Point X to Point Y at a speed of 60 km/hr and co

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A goes from Point X to Point Y at a speed of 60 km/hr and comes back with a speed of 80 km/hr. What is the average speed (in km/hr) of A for going and coming back?

[SSC MTS 22 September 2017 Shift 1]

A 66.66

B 68.57,

C 67.33,

D 69.43,