@Tucson, Pretty sure we looked at these charts in an earlier discussion:
How Many Calories Are Burned Walking per Mile?

Here is an article with a good calculator for running:
Calorie Burn Calculator | Calories Burned Running

Walking 4 mph would be about 95 calories per mile for your weight and running at 6 mph would be 140. It would be easier if you thought about % in distance rather than time.

In 45 minutes of walking at 4 mph, you would walk 3 miles and burn 285 calories.
in 15 minutes of running 6 mph, you would run 1.5 miles and burn 210.
So 495 for 4.5 miles = 110 calories per mile.

That's if you believe the articles I linked are valid and if those are your speeds. For different speeds, plug in different numbers and do the same calculation.