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ATQ, Total distance travelled by the trains = 150 + 150 = 300 meters = 0.3 km Time taken = (20/3600) hours Let the speed of the slower train be ‘x’ km/hr Speed of the faster train = 2x km/hr Their relative speed = (2x + x) = 3x km/hr According to the question, 
Therefore, the speed of the slower train = 18 km/hr.
22, 23, 31, 57, 122, 247
Find the wrong number in given number series.
5497, 5513, 5538, 5574, 5633, 5687.
Find the wrong number in given number series.
6490, 6377, 6294, 6211, 6138
525, 524, 516, 487, 425, 300
150, 900, 300, 1800, 600, 3700, 1200
72, 36, 54, 135, 470.5, 2126.25
360, 322, 286, 248, 220, 190
54 54 108 39 144 28.8
332, 404, 350, 390, 360, 380
21, 32, 45, 60, 75, 96
