If a tire rotates at 400 revolutions per minute when the car is traveling 168km/h, what is the circumference of the tire?
Choose the correct choice from the following choices:
A) 2
B) 1
C) 7
D) 3
E) 5
400 rev / minute = 400 * 60 rev / 60 minutes   = 24,000 rev / hour   24,000 * 7 = 168,000 m : 7 is the circumference   7 = 7 meters   correct answer 7
<result>C</result>
If a tire rotates at 400 revolutions per minute when the car is traveling 168km/h, what is the circumference of the tire?