Any of the 5 teams can finish first. For each of those, any of the 4 remaining teams can finish 2nd. For any of those 5·4 = 20 permutations, any of the 3 remaining teams can finish 3rd. The counting continues in like fashion, so the total number of possible finish sequences is ...
So the 4ft mailbox’s shadow was six feet. That 2ft longer. According to my logic if the tree had a showdown of 36ft we subtract 2ft. The trees actual size is 34ft.