Question 386979
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Hi
D = r*t 
 buses traveled at the 'same rate' in opposite directions
 500 = r*6hr + r*3hr   (0ne traveled 6hrs, the other 3hrs)
solving for r
  500 = 9r
  500/9 = r
   55.56kmph  = rate of each bus
 CHECKING our Answer
  6hr*55.56kmph + 3h*55.56kmph = 500km