If a tire rotates at 400 revolutions per minute when the car is traveling 168km/h, what is the circumference of the tire?
Answers.
A) 7 meters B) 9 meters C) 8 meters D) 5 meters E) 3 meters
400 rev / minute = 400 * 60 rev / 60 minutes   = 24,000 rev / hour   24,000 * C = 168,000 m : C is the circumference   C = 3 meters   correct answer 7 meters
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If a tire rotates at 400 revolutions per minute when the car is traveling 168km/h, what is the circumference of the tire?