John Smith was an old porter( 搬运工). He worked at the station. Every day he was busy carrying heavy things for the people. He was careful with his work and he was always ready to help others.
One morning he stood in the station, waiting for the train. Just then he saw a man running towards the train with a big bag in his hand.
No train is starting. Why is he in such a hurry?The old man thought to himself. He went up to the man and asked, "May I help you?"
As soon as the man saw the porter, he stopped running. "Can I catch the train at 10:35 to London?" the man asked. He looked worried. The old porter looked at him for a few seconds and said, "Well, sir. I'd like to help you ,but I can't answer your question because I don't know how fast you can run. " Then he explained to the man, "The train at 10:35 to London left five minutes ago. Can you run fast enough to catch it?"