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      Question

      A train 300 metre long takes 45 sec to cross a man

      running at a speed of 6 km/hr in the direction opposite to that of train. What is the speed of the train?
      A 23 km/hr Correct Answer Incorrect Answer
      B 18 km/hr Correct Answer Incorrect Answer
      C 30 km/hr Correct Answer Incorrect Answer
      D 20 km/hr Correct Answer Incorrect Answer

      Solution

      Let the speed of the train be x Relative speed = (x + 6) km/hr β‡’ (x + 6) = (300 Γ— 18)/(45 Γ— 5) β‡’ (x + 6) = (5400)/(225) β‡’ x + 6 = 24 β‡’ x = 24 – 6 = 18 km/hr

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