*edited to protect the interests of one hell of a raging lose-your-identity, drink-til-you-can-dance, get-so-drunk-your-ancestors-will-join-AA kind of an international shindig*
if an electric train travels west at 75mph and a electric train travelling in the opposite direction, east, pass the first train also at 75mph which way does the smoke go?
*edited to protect the interests of one hell of a raging lose-your-identity, drink-til-you-can-dance, get-so-drunk-your-ancestors-will-join-AA kind of an international shindig*