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Let A take x seconds in covering 1000m and b takes y secondsAccording to the question,
Ratio of the speed of A, B andC = 6 : 3 : 1⇒ Ratio of the time taken
Let the time taken to complete the race by A,B, and C be x minutes.
Relative speed of train= (60 + 6) kmph.
Speed of train = 72 kmph.