How far is the earth to the moon

  On a flight from Los Angeles to New York, a blonde girl sat with a lawyer. The lawyer asked the blonde if she wanted to play a fun game. The blonde was tired and just wanted to take a nap. She politely declined, and then took a nap near the window. The lawyer insisted on inviting the blonde to play the game and explained that the game is simple and fun: “I ask you a question, if you don’t know the answer, you give me 5 dollars, and vice versa.” The
  blonde refused again and tried to sleep for a while. . The lawyer felt bored on the journey, so he continued to pester: “Well, if you don’t know the answer, you pay me 5 dollars, if I don’t know the answer, I pay you 500 dollars.” This aroused the interest of the blonde. She thought: “Unless I agree to play this game, he will be entangled endlessly.” So she agreed to the lawyer’s invitation.
  The lawyer asked the first question: “How far is the distance from the earth to the moon?” The blonde didn’t say a word, reached into her purse, took out a $5 bill, and handed it to the lawyer.
  ”Okay,” said the lawyer, “it’s your turn.” The blonde asked, “What goes up the mountain with three legs, and goes down the mountain with four legs?” The lawyer thought for a while, puzzled. He had to take out his laptop and search the Internet, but still did not find the answer.
  At the thought of paying $500, the lawyer was a bit unwilling. So he sent an e-mail to all his friends and colleagues asking for help, but to no avail. An hour later, he had to wake up the sleeping blonde and handed her $500. The blonde said, “Thank you.” Then, she went back to sleep.
  The lawyer was very angry. He woke up the blonde and asked, “So, what’s the answer?” The blonde didn’t say a word, reached into her wallet, took out $5, handed it to the lawyer, and went back to sleep.