16 revolutions = 60 feet
(16/16) revolutions = (60/16) feet
1 revolution = 3.75 feet
This means that when the train wheel rotates a full 360 degrees, the train has moved 3.75 feet. Put another way, the circumference around the train wheel is 3.75 feet.
C = 3.75
We'll use this C value to find the radius r
C = 2*pi*r
3.75 = 2*pi*r
r = 3.75/(2*pi)
r = 0.5968 (this is approximate rounded to 4 decimal places)
Therefore the radius of the wheel is approximately 0.5968 feet