[tex]\dfrac{75 miles}{hour} * \dfrac{1 hour}{60 minues} = \dfrac{1.25 miles}{minute}[/tex]
Now you want to set up a proportion.
1.25 miles:1 minute :: x : 15 minutes Set up the proportion
[tex]\dfrac{1.25 miles}{1 minute}= \dfrac{x }{15 minutes}[/tex] Cross multiply
1.25 miles * 15 minutes = x * 1 minute
18.75 miles * minutes = x * 1 minute. Divide by minutes
x = 18.75 miles. Answer
