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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 = 30x Length of second train = Speed × Time = 20y So, {(30x + 20y)/(x+y)} = 24 ⇒ 30x + 20y = 24x + 24y ⇒ 6x = 4y Therefore, x:y = 2:3
Direction: Find the wrong number in given number series.
214, 230, 294, 550, 1574 , 5470.
16, 27, 44, 63, 98, 139
40, 60, 120, 300, 600, 3150
15, 42, 56, 183, 219, 562
1990,1877, 1794, 1711, 1638
1600, 1604, 1544, 1760, 1248, 2248, 520
231, 241, 233, 239, 235, 243
24, 34, 46, 76, 100, 140