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ATQ,
Speed of Train A: 50 m/s. Length of Train A = 50×4 = 200m. Quantity I: Train A crosses a man in Train B in 10 seconds, so relative speed = 200/10 = 20m/s. Speed of Train B = 50 − 20 = 30m/s. Quantity II: New speed of Train A if decreased by 20 m/s = 50 − 20 = 30m/s. Hence, Quantity I = Quantity II or No relation can be established
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