please help me with math. i cant figure it out

Question

A trucks wheel has a dimater of 36 iches and travels at 50 miles per hour. what is the angular speed in radians per minute

Answer 1

1 radian = 18 in

 

50 mph = 264,000 ft/hour

264,000 ft/hr = 4,400 ft/min

4,400 ft/min = 52,800 in/min

52,800 in/min = 2,933.33 radians / min