heya all, i need some help on a homework question. Here is the question-- We are located about 28000 light-years from the galactic center and we orbit the center once every 230 million years. How fast are we traveling around the galaxy? Give your answer in both km/hr and mi/hr. Okay, i know that we are trying to find the Speed. So speed = distance/time. so, 28000LYR/230 millions years = speed km my question is, since i know that 1LYR= 9.5x10^12 km, how do i change the 230 million years to km?.... so i can do the problem? thanks.