At age 66, and 8 stents, my cardiac rehab (3-times per week) includes treadmill incline interval training. Between 3.2 and 3.4 mph (average 3.25 mph) with incline varying up to 4%. This is kept up for a total time of 35-minutes. That equals something like 1.89 miles. I get a little sweaty, but not out of breath.
I take it that means that you have never walked or run the distance between Beckley and 10th street.
If Tippit was indeed killed at 1:14 (quod non), Oswald would only have had 10 minutes or so at to walk the distance and even that would be cutting it close.
If Tippit was actually killed between 1:06 and 1:10, as the evidence suggests, there is no way Oswald could have been there, at least not on foot.