Each morning during the week, Joe's wife, Beatrice, drops Joe off at the commuter train station, She also picks him up at the station when he returns in the evening. One day, Joe leaves work earlier takes the train, and arrrives one hour before his wife gets there to pck him up. Joe decides that rather than waiting, he will walk towards home. As it happens, Bea spots Joe walking on the road and they head for home. At the moment they pull into the drive, Joe looks at his watch and notices that he has actually arrived home 20 minutes earlier than usual.
How long did Joe walk
john walks for 60 minutes, before bea starts out. she then drives for 20 minutes (which would also add 20 minutes to john's time). They then drive home, another 20 minutes. That would get them both home in 40 minutes of the last hour, which would be with 20 minutes to spare.