Bonus question: Alright, the fly was flying at the constant speed of 100 mph the whole time; in which direction was it heading at exact the time when it was crushed? See below if you give up...
,.@|.@i. 11 10 9 8 7 6 5 4 3 2 1 0 In all directions perpendicular to the line in which it was flying before the crash? Alright, alright, let us change the question to make it less messy, for example: the trains are running in still in opposite directions but in parallel tracks next to each other, the fly is flying in between the tracks in the same pattern as before ... (and with all the other necessary modifications). In which direction was the fly heading at exact the time when the two trains crossed each other? On Tue, Apr 1, 2014 at 12:59 PM, Roger Hui <[email protected]>wrote: > There is a somewhat related anecdote. Two trains are 100 miles apart on a > straight track, facing each other and travel at 25 miles per hour toward > the other. At the same time, a fly flies at 100 miles an hour from one > train to the other and, when it reaches the other train, turns around > instantaneously and flies toward the other train, and so on. When the > trains crash, what is the total distance the fly flew? > > There is an easy way and a harder way to compute the answer. Someone posed > the question to John von Neumann. After a moment, he answered, 200 miles. > > Correct. Now, Johnny, how did you figure it out? > > I summed the series. > > > > > > > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
