Puzzle: A man I know, who lives in my neighbourhood, travels to Chinsura every day for his work. His wife drives him over to Howrah Station every morning and in the evening exactly at 6 P.M. she picks him up back at the station and takes him home.One day he was let off at work an hour earlier, and so he arrived at the Howrah Station at 5 P.M. instead of at 6. He started walking home. However he met his wife enroute to the station and got into the car. They drove home arriving 10 minutes earlier than usual.