Horse race riddle
A rich man is old and must decide who will inherit his fortune from one of his two sons. He makes a proposition. His two sons will ride their horses in a race, and whichever horse crosses the finish line last will win the fortune for its owner. During the race, the two brothers wander aimlessly for days, neither willing to cross the finish line. In desperation, they ask a wise man for advice. He tells them something; then the brothers leap onto the horses and charge toward the finish line. What did the wise man say?