Let the length of train ‘A’ be ‘x’ metres Therefore, length of the goods train = ‘4x’ metres Speed of train ‘A’ = 225 × (5/18) = 62.5 m/s According to the question, 4x + x = 62.5 × 30 => 5x = 1875 => x = 375 Therefore, time taken by train ‘B’ to cross train ‘A’ = {(375 + 225)/(30 + 10)} = 15 seconds
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