Hello! I have been having a bit of trouble with my calculus course, and I was wondering if you would be able to provide me with a detailed explanation on how to find this problem's solution?

9. Eleni and Analisa are driving to Ms. A's wedding. Eleni is going east at a rate of 50 mph and Analisa is driving south at 38 mph. At what rate is the distance between the cars changing when Eleni is 1 mile and Analisa is 34 mile from the wedding