Hi, good luck on the Adventure Racing. I have done several Adventure Races up to 36 hrs in length.

..I have to say this is an interesting "test" they have posed to you. I'm not sure how that can screen out the best "racers"....racing carries with it several elements, and although survival/preparedness issues are important, I hope they are not using that as the MAIN criteria for selection.
You probably already know this, but excellent fitness, good team cohesion(each team member can be star racers, but if you don't get along very well, you are screwed!), map & compass skills, love of the outdoors, long term endurance are also key factors in doing well & having a good time.

.....Keep us posted on how it goes!....GOOD LUCK!!!!!!!!