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      Question

      The speeds of train 'A' and 'B' are 25 m/s and 15 m/s,

      respectively. Whereas the lengths of train 'A' and 'B' are in the ratio 3:2, respectively. If the trains take 8 seconds to cross each other while travelling in opposite directions, then find the length of train 'A'.
      A 150 metres Correct Answer Incorrect Answer
      B 192 metres Correct Answer Incorrect Answer
      C 180 metres Correct Answer Incorrect Answer
      D 210 metres Correct Answer Incorrect Answer

      Solution

      Let the length of trains 'A' and 'B' be '3x' metres and '2x' metres, respectively. ATQ; {3x + 2x}/{25 + 15} = 8
      {5x/40} = 8
      5x = 320
      or, x = 64 So, length of train 'A' = 3x = 3 Γ— 64 = 192 metres

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