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      Question

      A train 400 metre long takes 40 sec to cross a man

      running at a speed of 4 km/hr in the direction same to that of train. What is the speed of the train?
      A 45 km/hr Correct Answer Incorrect Answer
      B 40 km/hr Correct Answer Incorrect Answer
      C 35 km/hr Correct Answer Incorrect Answer
      D 60 km/hr Correct Answer Incorrect Answer

      Solution

      Let the speed of the train be x Relative speed = (x - 4) km/hr ⇒ (x - 4) = (400 × 18)/(40 × 5) ⇒ (x - 4) = (7200)/(200) ⇒ x – 4 = 36 ⇒ x = 36 + 4 = 40 km/hr

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