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 = 31x Length of second train = Speed × Time = 19y So, {(31x + 19y)/(x+y)} = 24 ⇒ 31x + 19y = 24x + 24y ⇒ 7x = 5y Therefore, x:y = 5:7
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