It took Carla 36 minutes to run four miles. Convert this ratio into a unit rate by finding how long it took Carla to run one mile?
To convert the ratio into a unit rate, we divide the total time by the number of miles.
Therefore, to find how long it took Carla to run one mile, we divide 36 minutes by 4 miles:
36 minutes / 4 miles = 9 minutes
So, it took Carla 9 minutes to run one mile.