Question

an athlete completes one round of a circular track of diameter 200m in 40s what will be the distance covered and the displacement at the end of 2 minutes 20s

Answer 1

Athlete completes one round in 40 seconds, 
total time = 2 minute 20 second = 140 s
number of rounds = 140/40 = 3.5

So he would have covered 3 complete rounds and half round. So he would exactly at the diametrically opposite point of the starting point in the circular track. 
Thus displacement = length of diameter = 200m
Distance covered = 3.5 times the circumference of circular track = 3.5×π×d =3.5×π×200= 2200m

Answer 2

Hope this answer helps you.......