Hi

trains  pass the station 30min apart.  Note: 60min = 1 hr 

Let x and (x + 30/60) represent time traveled by B and A respectively

D = r*t, distances will be the same from the station when B catches A 

 84x = 80(x+ 1/2hr)

solving for x

 84x = 80x+ 40hr

  4x = 40hr

   x = 10hrs, time in hours traveled by B

 train B will catch up to train A at  1:55  (3:55 + 10hrs) 

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