Riddle: An old man dies, leaving behind two sons

An old man dies, leaving behind two sons.

In his will, he orders his sons to race with their horses, and the one with the slower horse will receive his inheritance.

The two sons race, but since they’re both holding their horses back, the scenario doesn’t really work.

Perplexed, they go to a wise man and ask him what they should do.

After that, the brothers race again – this time at full speed.

What did the wise man tell them?

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Answer: 

That if they switch horses, whoever wins the race will get the inheritance because they still technically own the losing (that is, the slower) horse.