A great king had 2 sons, twins, and no other heirs. Rather than divide his kingdom, he proposed an odd sort of race to decide which 1 would receive his inheritance.
He gave them each 1 horse, and said that the owner of the horse that reached a certain city the slowest would inherit the kingdom
After several days of being confused, the princes sought the council of a wise man. After receiving his council, each man mounted a horse and rode as he could to reach the city first.
What did the wise man tell the princes to do with the horses?

Trade the horses with each other