SOLUTION: Each wheel on a vehicle has a radius of 20 inches. if the vehicle's wheels rotate 360 revolutions per minute, what is the approximate speed of the vehicle in miles per hour? Round

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Question 705656: Each wheel on a vehicle has a radius of 20 inches. if the vehicle's wheels rotate 360 revolutions per minute, what is the approximate speed of the vehicle in miles per hour? Round to the nearest ten miles per hour.
Answer by nerdybill(7384) About Me  (Show Source):
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Each wheel on a vehicle has a radius of 20 inches. if the vehicle's wheels rotate 360 revolutions per minute, what is the approximate speed of the vehicle in miles per hour? Round to the nearest ten miles per hour.
.
circumference of wheel:
2(pi)(r)
2(3.14)(20)
(3.14)(40)
125.6 inches
.
360 rev/min * 125.6 inches/rev
45216 inches/min
45216 inches/min * 60 min/hour
2712960 inches/hour
2712960 inches/hour * 1feet/12inches
226080 feet/hour
226080 feet/hour * 1mile/5280feet
42.82 miles/hour
rounded to nears 10 mph:
42 miles/hour