A "light-year" is the distance light (speed = 2.998 108 m/s) travels in one year.
(a) How many meters are there in 3.00 light-years? ( m)
(b) An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 108 km. How many AU are there in 3.00 light-year? (AU)
(c) What is the speed of light in AU/h?