Question 414591
  <pre><font face = "Times" size = 3 color = "indigo"><b>
Hi
A cyclist completed 5 laps of a circular track in one hour OR 1 lap in 1/5hr
 Distance = r*t = 20mph*1/5hr = 4mi around the track

Circumference = pi*d
   4mi = pi*d
  4mi/3.14 = diameter of the track.