Recently, I went in for a series of technical interviews in search of a new position. As is typical in an interview for the types of jobs I seek, I was given a few reasoning/logic/brain teaser types of problems. One of them really stumped me, and it was only after being pushed in the right direction that I was able to see the correct approach and arrive at an answer.
Here it is for all of your entertainment.
A man arrives at the train station after work at 5pm daily. His wife always leaves the house earlier to pick him up and she arrives at 5pm sharp every day. After pick up, they head straight home. The commute time each way is always the same, so they get home at the same time each and every day. To be clear, both one-way trips (to and from) take the same amount of time.
One day the man catches the earlier train and arrives at the train station at 4pm. His wife does not know this, and so she is on her normal schedule. The man (at 4pm) decides to start walking home to save his wife some time. The wife sees him on the road on her way to the station. She picks him up and they turn around and head home. They arrive home 10 minutes earlier than their normal arrival time.
For how long did the man walk for?