An old porter worked at the railway station for a long time .One moreing he was standing and waiting for travelers to ask himto help them with their luggage ,when he saw a short man running towards to the train with a big bag in his hand。 The porter watched the man for a few seconds,and then the man saw him.at once the short man ran up to the porter and asked,"Can i catch the 10:35train to london, porter?"He was breathing very fast,and he seemed worried. The old porter looked ai him for a moment and then said with a smile."Well,sir,I'd like to heip you,but I can't answer your question because I don't know how fast you can run along rails.You see,'he explained,"The10:35 train to London left five minutes ago."