## Algebra and Trigonometry 10th Edition

$[0,3]$
Since the distance of $3$ miles satisfies the segments $x$ and $3-x$, we consider $3-x \geq 0$ and $x \geq 0$ $\implies x \leq 3$ and $x\geq 0$ So, the domain for $x$ is: $[0,3]$