So for this you want to set up a proportion, like this:
[tex]\frac{16 miles}{144 minutes} = \frac{36 miles}{X minutes}
Then, you want to solve for X by cross multiplying, like this:
[tex]\frac{16 miles}{144 minutes} = \frac{36 miles}{X minutes} \\ 16 miles*X minutes = 144 minutes*36 miles[/tex]
After that, solve the equation for X to get your answer in number of minutes, like this:
[tex]16 miles*X minutes = 144 minutes*36 miles \\
16X= 5184 minutes \\ \frac{16x}{16}= \frac{5184 minutes}{16}
\\ X= 324 minutes[/tex]
