Hi there!
The easiest way to solve this problem is to set up an equation: 2340 = 52x. The 2340 representing the number of miles she plans on running, 52 representing the number of weeks in a year, and x representing the unknown number of miles per week she should run. To solve for x, just divide both sides by 52. The answer is 45 miles per week.
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!