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      Question

      The speeds of train 'A' and 'B' are 20 m/s and 30 m/s,

      respectively. Whereas the lengths of train 'A' and 'B' are in the ratio 4:6, respectively. If the trains take 5 seconds to cross each other while travelling in opposite directions, then find the length of train 'A'.
      A 80 metres Correct Answer Incorrect Answer
      B 140 metres Correct Answer Incorrect Answer
      C 100 metres Correct Answer Incorrect Answer
      D 120 metres Correct Answer Incorrect Answer

      Solution

      Let the length of trains 'A' and 'B' be '4x' metres and '6x' metres, respectively. ATQ; {4x + 6x}/{20 + 30} = 5 {10x/50} = 5 10x = 250
      x = 25
      So, length of train 'A' = 4x = 4 ├Ч 25 = 100 metres

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