South. -- Raul
On Thu, Apr 3, 2014 at 5:53 PM, Jose Mario Quintana < [email protected]> wrote: > 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
