Final answer:
Mary runs approximately 0.1165 miles per minute, calculated by dividing her total distance of 12 miles by the total time of 103 minutes.
Step-by-step explanation:
To find out how many miles Mary runs per minute, we need to divide the total number of miles she runs by the total number of minutes it takes her. Mary runs 12 miles in 103 minutes, so we use the formula:
Speed (miles per minute) = Total distance (miles) ÷ Total time (minutes)
Plugging in the values we get:
Speed = 12 miles ÷ 103 minutes = 0.1165 miles per minute
Therefore, Mary runs approximately 0.1165 miles per minute.