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      Question

      Train тАШAтАЩ can cross a pole in 4 seconds and a 150

      metre long platform in 10 seconds. If the ratio of length of train тАШAтАЩ and train тАШBтАЩ is 2:5, respectively, then find the time taken by train тАШBтАЩ to cross a pole with a speed of 25 m/s.
      A 10 second Correct Answer Incorrect Answer
      B 12 second Correct Answer Incorrect Answer
      C 13 second Correct Answer Incorrect Answer
      D 14 second Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the length and speed of the train тАШAтАЩ be тАШlтАЩ metre and тАШsтАЩ m/s, respectively. According to question, l = 4s Also, 10s = 4s + 150 Or, 6s = 150 Or, s = 25 Therefore, length of train тАШAтАЩ = 4s = 100 metres Length of train тАШBтАЩ = 150 ├Ч (5/2) = 250 metres Required time taken = 250 ├╖ 25 = 10 second

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