April 2008 Brainteaser Solutions

Published Monday, March 10, 2008

1. Trainspotting Freight trains were always scheduled to come six minutes after passenger trains. That means that 54 out of every 60 minutes, the man would arrive at the station, wait for a passenger train and then leave. There are only six minutes per hour, however, when he would arrive having missed the passenger train, and would wait to encounter a freight train. Thus probability dictates that the man’s odds of arriving after a freight train, and before a passenger train, are 54:6 or 9:1, or 90 percent. 1. Trainspotting Freight trains were always scheduled to come six minutes after passenger trains. That means that 54 out of every 60 minutes, the man would arrive at the station, wait for a passenger train and then leave. There are only six minutes per hour, however, when he would arrive having missed the passenger train, and would wait to encounter a freight ...

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