How to calculate the light-years and convert to miles

1. If a galaxy is 1,000 Mpc away, how fast is it recedingfrom us?

2. The Milky Way has a radius of approximately 100,000light years. How many miles isthat? How long would it take you totravel across our galaxy if you were traveling at 50% the speed of light(be sure to show your work for full credit)?