Answer:
[tex]\large \boxed{\text{251.7 km}}[/tex]
Step-by-step explanation:
Officer Ron is driving along the sides of a right triangle, so we can use Pythagoras' Theorem to calculate the distance from his starting point.
[tex]\begin{array}{rcl}x^{2} & = & y^{2} + z^{2}\\& = & 30^{2} + 250^{2}\\& = & 900 + 62500\\& = & 63400\\x & = & \sqrt{63400}\\& \approx & \mathbf{251.7}\\\end{array}\\\text{Officer Ron is $\large \boxed{\textbf{251.7 km}}$ from his starting point}[/tex]
