Determine the k value. Assume the original factory tire on the jeep had a diameter

Determine the k value. Assume the original factory tire on the jeep had a diameter om
28 inches. You decide to put on new tires. Your odometer
reads you driving at 65mph.
How fast are you really driving if your new tires have a
diameter of:(Use your first name to determine the diameter)
A-H: 34 inches I-Q: 36 inches R-Z: 38 inches