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ATQ, Speed of first train = 60 km/h = 16.67 m/s Speed of second train = Twice the first = 33.33 m/s Relative speed (opposite direction) = 16.67 + 33.33 = 50 m/s Total time to cross = 10 sec Using the formula: Total Distance = Relative Speed × Time (200+L)=50×10 = 500 L= 300 meters Hence, the length of the second train is 300 meters.
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