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Speed of train = 36 kmph
If the speed of train be x kmph then,Its relative speed = (x + 3) kmph
If the speed of the train be x kmph, then relative speed = (x – 3) kmph.
Distance covered in 10 minutes at 20kmph = distance covered in 8 minutes at (20 + x )kmph
Relative speed of train= (36 – 9) kmph = 27 kmph