if a planet was located approximately 25.0e3 light years from the center of a galaxy and orbits that center once every 204.6e6 years, how fast is the planet traveling around the galaxy in km/hr?

Question

if needed use 3e8 m/a for the speed of light.

Answer 1

NOT an astronomy question. Simple algebra. A circular orbit is assumed; figure the circumference, then figure the speed. Do you need formulas for circumference and speed? (Not, I hope....)