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      Question

      Train X running at a speed of 35 km/hr crosses train Y

      in 18 seconds. Find the speed of train Y (in km/hr), if the sum of the length of train X and Y is 550 meters and both trains running in the opposite direction.
      A 60 km/hr Correct Answer Incorrect Answer
      B 85 km/hr Correct Answer Incorrect Answer
      C 75 km/hr Correct Answer Incorrect Answer
      D 65 km/hr Correct Answer Incorrect Answer
      E 80 km/hr Correct Answer Incorrect Answer

      Solution

      Let speed of train Y be 'a' km/hr. According to question, => 18(35 + a) × (5/18) = 550 => 630 + 18a = 1980 => 18a = 1350 => a = 75 km/hr

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