An Arab sheikh tells his two sons to race their camels to a distant city to see who will inherit his fortune.

Problem

An Arab sheikh tells his two sons to race their camels to a distant
city to see who will inherit his fortune.  The one whose camel is
slower will win.  The brothers, after wandering aimlessly for days, ask
a wise man for advise.  After hearing the advice they jump on the
camels and race as fast as they can to the city.  What does the wise
man say?