1 foot = 12 inches 1 yard = 3 feet 1 mile = 1760 yards 1 centimeter = 10 millimeters 1 meter = 100 centimeters 1 kilometer = 1000 meters 1 mile ~8/5 kilometers 1 meter 1.1 yards 1 inch 2.5 centimeters. ~ rCooper 4.1.3 The Earth travels in a circle around the sun once every year. The radius of the circle is 98 million miles. What is the speed of the Earth in miles per hour? In centimeters per day? Use the conversion factors on page 55. mi/hr cm/day