If a tire rotates at 400 revolutions per minute when the car is traveling 72km/h, what is the circumference of the tire? Options
A) 2 meters
B) 6 meters
C) 5 meters
D) 3 meters
E) 7 meters
400 rev / minute = 400 * 60 rev / 60 minutes   = 24,000 rev / hour   24,000 * C = 72,000 m : C is the circumference   C = 3 meters   correct answer 3 meters
<result>D</result>
If a tire rotates at 400 revolutions per minute when the car is traveling 72km/h, what is the circumference of the tire?