Math, Amtrak Style
I had a page open to check the progress of an Amtrak train, so that I could know when to pick up a passenger. Not a lot of info was available. As of 8:30PM, it just said “on time” for 9:00PM (though the timetable said 9:13PM instead of 9:00PM, just to keep things interesting).
I arrived at the station at 9:00PM to find out that the train had arrived at 8:30PM. When I returned home, I refreshed the page from the Amtrak site, curious what it would say. There were two surprises. The first was that it said that the train had actually arrived at 8:40PM. The second was how late the site said this 20-minutes-early train was.