Question

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Answer 1

Hey here's your answer!

Let the distance covered during A to B = s

So distance covered during B to A = s

From A to B:-

distance = s

speed = 60 km/h

So time = s / 60 h --------> v = s/t

From B to A:-

distance = s

speed = 80 km/h

So time = s / 80 h --------> v = s/t

Average speed = Total distance / Total time

Total distance = 2s

Total time = s / 60 + s / 80 = 140 *s/4800

Average speed = (2*s)/(140*s/4800)

                          = 2*4800/140

                          = 68.57 m/s

Average velocity is 0 because it returns to the initial position

Hope this helps! :)