Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. a light year is the distance light travels in one year. state the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i. e., this is not a measurement.) a. 1.8600 x 105 mi/s light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. a light year is the distance light travels in one year. state the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i. e., this is not a measurement.) a. 1.8600 x 105 mi/s b. 5.1854 x 1012 mi/s