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      Question

      Train β€˜L’ is travelling with a speed of 90 km/hr

      and crosses a vertical pole in 4 seconds. Train β€˜K’ is 60 metres longer than β€˜L’ and travelling with a speed 1/5th less than that of train 'L'. In how much time train K can cross a 180 metres long platform?
      A 20 sec Correct Answer Incorrect Answer
      B 18 sec Correct Answer Incorrect Answer
      C 19 sec Correct Answer Incorrect Answer
      D 17 sec Correct Answer Incorrect Answer

      Solution

      Speed of train β€˜L’ = 90 Γ— (5/18) = 25 m/sec Length of train β€˜L’ = 25 Γ— 4 = 100 metres Therefore, speed of train β€˜K’ = (4/5) Γ— 25 = 20 m/sec Length of train β€˜K’ = 100 + 60 = 160 metres Required time taken = (160 + 180)/20 = 340/20 = 17 seconds

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