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Let the speed one train be x m/s and the speed of the second train be y m/s. Length of the first train = Speed × Time = 36x Length of second train = Speed × Time = 21y So, {(36x + 21y)/(x+y)} = 27 ⇒ 36x + 21y = 27x + 27y ⇒ 9x = 6y Therefore, x:y = 2:3
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