Express the Angular Speed in Radians Per Second

Multiple Choice

Express the angular speed in radians per second.
-A pick-up truck is fitted with new tires which have a diameter of 41 inches. How fast will the pick-up truck be moving when the wheels are rotating at 415 revolutions per minute? Express the answer in miles per hour rounded to the nearest whole number.

A) 51 miles per hour
B) 8 miles per hour
C) 56 miles per hour
D) 25 miles per hour