A father and his young son get into a bus in a small city and sit down. The bus conductor comes to them for their money. The man says "I want one ticket to Oxford." and gives her a shilling( ). The conductor looks at the small boy for a few seconds and then says to him, "How old are you young man?" The man begins speaking,but the conductor stops him,and the boy says, "I'm four years old at home, and two and a half in buses and trains." The man has to take six pence  out of his bag and gives the money to the conductor. The conductor gives him one and a half tickets. One day the father takes a bus  _  .
to a small city to get some money with his son to get a ticket