If a planet was located approximately 28 thousand light-years from the center of a galaxy and orbits that center once every 284 million years, how fast is the planet traveling around the galaxy in km/hr? If needed, use 3.0 × 108 m/s for the speed of light.
Light years is a distance 28 x 10^3 light years is how far light woud travel in that time
28 x 103 x 3600 s/hr x 24 hr/day x 365 day/yr x 3 x108 m/s x 1 km/1 x 10^3 m x 2 x pi = distance ( in km in 284 x 106 years)
now divide that by
24 x 365 hrs / year x 284 x106 yr to get ........... km / hr