Question 619728
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Hi,
How far {{{highlight(x)}}} can the members of a bicycling club ride out into the country at a speed of 12 mph 
and return over the same road at 8 mph if they travel a total of 10 hours? 
 D = rt   or D/r = t
  x/12mph + x/8mph = 10hrs   |Multiplying thru by 24 so as all denominators = 1
   2x + 3x = 240
    5x = 240
     x = 48mi
CHECKING our Answer***
    48mi/12mph + 48mi/8mph = 4hr + 6hr = 10hr