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ATQ,
Relative speed = 55 + 60 = 115 km/h = 115 × 5/18 = 31.94 m/s
Let the length of train X be ‘x’ meters
So, 4x = 31.94 × 18
Or, 4x = 575
Or, x = 143.75 ≈ 144 metres
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