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      Question

      A train travelling with a speed of 54 km/h can cross a

      pole in 6 seconds. Find the time taken by the train to cross a 210 metres long platform if the speed of train is increased by 25%.
      A 15 seconds Correct Answer Incorrect Answer
      B 22.5 seconds Correct Answer Incorrect Answer
      C 14 seconds Correct Answer Incorrect Answer
      D 10 seconds Correct Answer Incorrect Answer
      E 16 seconds Correct Answer Incorrect Answer

      Solution

      Speed of train = 54 Γ— 5/18 = 15 m/s Length of train = 15 Γ— 6 = 90 metres Desired time = (210 + 90)/(1.25 Γ— 15) = 16 seconds

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