Length of circular track is:
L = 2rpi
He run 3/4 of it so length is:
L' = 32/4rpi = 3/2rpi
To calculate speed of his movement we use formula:
v = s/t where s = L' and t = 1 minute 45 seconds = 105 seconds
v = L'/t = \(\frac{3*r*pi}{2*105}\)
v = r pi/70
If we take that r = 1 answer is \(\pi /70\)
