Just focus on finishing jogging/running non stop in time allotted. Don't worry about distance or speed. That will come. You are working on endurance now. I just finished Week 5 Day 3. My actual distance covered was 1.75 miles but I jogged non stop. Also don't fall into the trap of I feel good so I am going to sneak a extra run in. Especially going forward from Week 5 it will burn you.
Don't be intimidated by Week 5 day 3. It is easier than it sounds. If you have to repeat week repeat it. Just don't quit.
Endurance first. Speed and distance will come. If someone pases you don't try keep up just remind yourself that I am faster and stronger than I was at Week 1 Day 1 and that's what counts.