One day, a traveller on the road asked Aesop,"Kind man, could you please tell me how long it will take me to get to town?"
  "Go," Aesop answered.
  "I know I must go," said the traveller, "but I want to know how soon I can get there."
  "Go," Aesop shouted at him.
  The traveller was very angry."This man must be mad," he thought, and walked on.
  Suddenly he heard Aesop shouting,"You will get there in two hours."
  The traveller turned back and asked,"Why didn't you tell me that before?"
  Aesop answered with a smile, "Because I didn't know how fast you could walk!"