A joke about a not so dumb blonde.

So a blonde on a plane is sitting next to a bored lawyer and is challenged to a bet.The lawyer says he will ask a question and if the blonde gets it wrong she gives him five dollars.Then the blonde gets to ask a question.If the lawyer gets it wrong the lawyer will give the blonde a thousand dollars.The blonde accepted.
The lawyer asks "How far is it to the moon?"
The blonde hands over five dollars then asks.What goes up a hill with two legs then comes down the hill with three legs?"
The lawyer does not know,he checks with Google and still no answer.He hands over the thousand dollars to the blonde.He asks the blonde for the answer.She hands him five dollars.