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Answer : 2 400 mts Explanation : Answer: B) 400 mts Explanation: Let the length of the 1st train = L mtsSpeed of 1st train = 48 kmphNow the length of the 2nd train = L/2 mts Speed of 2nd train = 42 kmphLet the length of the bridge = D mtsDistance = L L/2 = 3L/2Relative speed = 48 42 = 90 kmph = 90 x 5/18 = 25 m/s(opposite)Time = 12 sec=