25 Feb '07 17:55>
Every day, Bill takes the train to travel from his work back to Llareggub, his place of residence. Usually, he arrives at the station of Llareggub at six o'clock, and exactly at that moment he is picked up by his wife by car. Yesterday evening, Bill took an earlier train, without informing his wife, and therefore he already was at the station of Llareggub at five o'clock. He decided to walk part of the way to meet his wife. When he met the car with his wife, he drove home with her. In this way, they were home ten minutes earlier than normal.
For how long did Bill walk yesterday evening?
For how long did Bill walk yesterday evening?