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A wheel has a 12 inch radius rotating at 620 RPM. What is the speed of the car in MPH?

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circumference = 24π inches

so speed = 24π(620) inches/min
= 14880π/(12(5280)) miles/min
= 14880π/(12(5280)) miles/ (1/60) hrs
= 44.27 mph

check my arithmetic

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