The outer diameter of a car tire is 8 decimeters, and the wheels roll 500 cycles per minute. How many kilometers does the car travel per hour?
0.8 times PI (3.14) equals tire circumference (2.512)
Multiply 500 by tire circumference (2.512) equals the distance per minute (1256)
Then the distance per minute (1256) multiplied by 60 equals 75360 decimeters
75360 decimeters equals 75.36 kilometers
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