It took Carla 36 minutes to run four miles. Convert this radio into a unit rate by finding how long it took Carla to run one mile
To convert the time taken to run 4 miles into a unit rate, we divide the total time by the number of miles.
Carla took 36 minutes to run 4 miles.
Therefore, it took Carla 36/4 = <<36/4=9>>9 minutes to run one mile.
So, Carla ran one mile in 9 minutes.