With 2 all female teams already, I would be shocked with a 3rd. Those 2 girls packed to light to be racers, unless they never planned on being in it long in the first place. And speaking of the all female teams, the blondes are not their in the photo. Maybe they start out at the back of the pack.
As for those 3 guys, I'm thinking the 2 together on the left might be the frat boys. I know neither of them have a jew-fro, but they fit the age discription.