Jake really trusted that Zack was able to run that marathon in less than 3 hours, and thought until he was able to run in a time of close to 2 hours and 30 minutes, and if Jake was right it meant that Zack could run in the group of elite in the marathon and still finish the marathon without getting exhausted.
Zack had really asked Coach Davis this before, the biggest difficulty for Zack and other athletes in the marathon was keeping a steady running pace so they wouldn't get too tired, and that was the biggest benefit of running in Jake's group who was a master of running at the right pace, even if Jake's pace was very fast.
And after running 15 km in Jake's group he just had to run at a slower pace than normal and continue as soon as Zack could finish the marathon before 3 hours, and if in the final part of the marathon he still had breath I could try to get an even better time.
