Step 1 :The problem is asking for the speed of Natalie in miles per hour. Speed is calculated by dividing the distance by the time. In this case, the distance is \(\frac{3}{5}\) mile and the time is \(\frac{1}{2}\) hour. So, we need to divide \(\frac{3}{5}\) by \(\frac{1}{2}\) to find the speed.
Step 2 :Let's denote the distance as 0.6 and the time as 0.5.
Step 3 :By dividing the distance by the time, we get the speed as 1.2.
Step 4 :Final Answer: Natalie walked at a speed of \(\boxed{1 \frac{1}{5}}\) miles per hour.