Question 632364
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Hi,
Question states*** They each drive the same amount of time:  t = D/r
Let x represent the amount of distance driven by Kelvin
  {{{x/50 = (385-x)/60}}}     | Cross Multiplying to solve
       60x = 50(385-x)
      110x = 19250
         x = 175, distance driven by Kelvin.  t = 175/50 =3.5 hrs 
left home at 3:00 P.M. met at 6:30 P.M.

and(just checking...) Sandy's time = 210/60 = 3.5 hrs