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      Question

      Train ‘A’ running with a speed of 54 km/hr can cross

      a standing goods train of 4 times its length in 30 seconds. Find the time taken by 210 metres long train ‘B’ which is coming from opposite direction of train ‘A’, with a speed of 35 m/s, to cross train ‘A’.
      A 15 seconds Correct Answer Incorrect Answer
      B 5 seconds Correct Answer Incorrect Answer
      C 6 seconds Correct Answer Incorrect Answer
      D 7 seconds Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the length of train ‘A’ be ‘x’ metres Therefore, length of the goods train = ‘4x’ metres Speed of train ‘A’ = 54 × (5/18) = 15 m/s According to the question, 4x + x = 15 × 30 => 5x = 450 => x = 90 Therefore, time taken by train ‘B’ to cross train ‘A’ = {(90 + 210)/(15 + 35)} = 6 seconds

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