The diameter of a car's outer tire is 9 decimeters, and the wheels roll 1000 cycles per minute. How long does this car advance per hour?
1 hour = 60 minutes & nbsp; C = π d = 3.14 × 9 = 28.26 (decimeter) & nbsp; 28.26 × 1000 × 60 = 28260 × 60 = 1695600 (decimeter) = 169.56 (km) a: this car advances 169.56 km per hour
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