Distance traveled by Garrett =
mile
Time taken to travel the distance =
hour
We have to find how fast was he traveling in miles per hour, means we have to calculate the speed.
Speed is a measure of how quickly an object moves from one place to another. It is equal to the distance traveled divided by the time.
Speed = Distance traveled
Time taken
=

=

= 4 miles per hour
Therefore, Garrett traveled at the speed of 4 miles per hour.