How fast rpm your 20 inch diameter wheel is rotating when yo

How fast (rpm) your 20 inch diameter wheel is rotating when you driving at 55 mph? 1 mile = 5280 ft., 1 ft. =12 inches. (Calculator may be used)

Solution

linear velocity of vehicle/wheel = radius of wheel * angular velocity of wheel

55 mph = (20/2)* Angular velocity

Angular velocity = (55*5280*12)/ (10*60) rpm = 5808 rpm