Question 1163370
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If the trains are traveling in opposite directions, they are moving apart at the sum of their speeds.  Divide the stated distance by the sum of their speeds.  Of course, this calculation presumes that there is a perfectly straight run of train track with a station slightly east of center somewhere where this scenario could possibly play out.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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