A train covered a distance of 250 km,partly at an average speed of 40 kmph and partly at 60 kmph. Find the distance covered at 40 kmph if it took 5 hrs for the train to cover the distance.
a)150 km b)120 km c)100km d)cannot be determined

• d = distance at 40
  { d/40 + (250-d)/60 }= 5
  Multiply by 120
  3d + 2*(250-d) = 600
  so d is 100km
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