A cycle traveling in circular track, in this case the total distance travelled is around a circular track, which means we have to find the circumference, which is 2πr.
r=50m so the circumference would be 2*π*50 = 100π
time taken for completion= 4 mins
therefore speed= 25π m/s where π=3.14
(ii)average velocity = total displacement/total time taken
Where avg velocity =0