Answer:
67 mile per hour
Explanation:
You have 4.5 hours = 300 mile (Between St. Louis and Chicago), so you have to figure how much miles you travel in 1 hr., since the question says what speed the person travel at. Divide 4.5 from 4.5 and do the same thing for 300. You get 1 hour = 66.6 miles (decimal repeating), since you to simplify to the nearest whole number you get 67 miles. I hope this makes sense.