The rate of change in this case is the speed of his car or how many miles he drives in one hour.
He drives 110 miles in 4 hours, which means he will drive 110/4 miles in 1 hour because 4 hours is four times greater than 1 hour.
110/4=27.5 miles
27.5 miles in one hour or 27.5 mph
answer: 27.5 mph
