If a tire rotates at 400 revolutions per minute when the car is traveling 168km/h, what is the circumference of the tire?  Options:
A) 7 meters
B) 9 meters
C) 8 meters
D) 5 meters
E) 3 meters

Rationale: "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 a"
Answer: A