Answer: It takes 12 minutes to run each mile.
Step-by-step explanation:
Given: It takes Beth 157.2 minutes to run a 13.1 mile race.
i.e. Time taken to run 13.1 miles = 157.2 minutes
Then, Time taken to run 1 mile = [tex]\dfrac{\text{Time taken to run 13.1 miles }}{13.1}[/tex]
[tex]\dfrac{157.2}{13.1}\\\\=\dfrac{1572}{131}\\\\=12\text{ minutes}[/tex]
Hence, it takes 12 minutes to run each mile.