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Start learning 50% faster. Sign in nowLet the length of train ‘A’ be ‘x’ metres Therefore, length of the goods train = ‘4x’ metres Speed of train ‘A’ = 108 × (5/18) = 30 m/s According to the question, 4x + x = 30 × 20 => 5x = 600 => x = 120 Therefore, time taken by train ‘B’ to cross train ‘A’ = {(120 + 200)/(20 + 12)} = 10 seconds
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