A TIRE FOR A COMPACT CAR IS 21 INCHES IN DIAMETER. IF THE CAR IS TRAVELING AT A SPEED OF 80 MILES/HOURS, FIND THE NUMBER OF REVOLUTIONS THE TIRE MAKES PER MINUTE.
diameter is 21 inches
circumference of tire is = pi*d
= 22/7 *21
= 66 in
car speed is 80 miles/hr = 2145.792 m/m [ 1 mile/hr=26.8224 meters/minute]
66 inches = 1.6764 meters/rev [ 1 inches = 0.0254 meters]
rev= 2145.792 / 1.6764
= 1,280 rev / minute
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