A car is traveling at 61 mph. The car tire has a diameter of of 26 inches. At what rate is the tire rotating, measured in revolutions per minute?

Answer 1

1 revolution of the tire advances the vehicle 2*pi*((26/(2*12)) ft = 6.8068 ft

61 miles/hour = 5368 ft/min Let x = unknown revolutions/miin

So, 1 rev/min = 6.8068 ft/min Using a ratio 1 rev/min = 6.8068 ft/min

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x rev/min 5368 ft/min

Solving for x = 788.6 rev/min