Explanation
We are required to determine how far Carmen has driven.
This is achieved thus:
[tex]\begin{gathered} \text{ total drive length }=36miles \\ \text{ Drive completed }=\frac{3}{4}\text{ }of\text{ T}otal \\ \therefore Drive\text{ }completed=\frac{3}{4}\times36miles=3\times9miles \\ Drive\text{ }completed=27miles \end{gathered}[/tex]Hence, the answer is:
[tex]27miles[/tex]