Today's run

9.2k in 47 min 26 sec at 5:09/k pace

First 1.8k: 9 min at 5:00/k

Next 3.8k: 20 min at 5:16/k

Next 3.6k: 18 min 26 sec at 5:07/k

5k time: approx. 25:45
Projected 10k time: 51:30

A question: Do 10-1s help reduce your time when you're running this short of a distance? They definitely make the experience more pleasant, that's for sure, but if you're strictly talking about times, I'm thinking they probably don't.