Answer:55
Step-by-step explanation:
You can write the equation as 220 miles over 4 hours = x over 1 hour. X represents the average speed in miles per hour. You need to cross multiply 220 and 1 to 4 and x. You get 220=4x. You just simply divide 4 on each side of the equation and get x=55, so the average speed in mph is 55.
