Question 662153
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Hi,
A passenger train leaves Chicago while a freight train leaves from New York headed toward each other on parallel train tracks.
the cities are 560 miles apart
freight train is traveling 20 mph slower than a passenger train's rate{{{highlight(x)}}} 
Question states*** They meet in 4 hours.  Note D = rt
 4x + 4(x-20) = 560mi
   8x = 640
    x = 80mph, rate of the passenger train.  Freight Train's rate is 60mph
and...
  {{{4hr*80mph + 4hr*60mph = 560mi}}}