Barry walked a total of 3 miles to larry's house. if he walked for 45 minutes to get there, how fast was he traveling (r) in miles per hour?

Use the formula d = rt (where d is the total distance traveled, r is the average rate of travel, and t is the total time taken to travel the distance given) to solve this problem.

We'll simply substitute the known values in and solve for r.

3 = 0.75r (The reason I am substituting 0.75 for t instead of 45 is that the problem is asking for how fast he travels in terms of miles per HOUR, not hours per minute. 45 minutes is 0.75 of 1 hour.)

4 = r

Barry walked at an average speed of 4 miles per hour!