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      Question

      Ravi is sitting inside train M which is travelling at a

      speed of 45 km/h. Another train N, whose length is half the length of train M and travelling with a speed of 65 km/h (in opposite direction to that of train M) crosses Ravi in 10 seconds. Find the length of train M (in metres).
      A 417 Correct Answer Incorrect Answer
      B 255 Correct Answer Incorrect Answer
      C 611 Correct Answer Incorrect Answer
      D 590 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Relative speed = 45 + 65 = 110 km/h = 110 Γ— 5/18 = 30.56 m/s

      Let the length of train M be β€˜x’ meters

      So, 0.5x = 30.56 Γ— 10

      Or, 0.5x = 305.6

      Or, x = 611.2 β‰ˆ 611 metres

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