Louis and Francis live 2 miles apart. It takes Louis 30 min. to walk from her house to Francis house. At what rate is Louise walking

Louis is walking at 4 mph. If Louis can walk 2 miles in 30 minutes, she can then walk 4 miles in an hour if you double the amount of time she is walking from 30 to 60, so you would also double the distance. She is walking at 4 miles per hour.

Louis is walking 4miles