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      Question

      A train travelling with a speed of 108 km/h can cross a

      pole in 5 seconds. Find the time taken by the train to cross a 210 metres long platform if the speed of train is increased by 20%.
      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

      Solution

      Speed of train = 108 Γ— 5/18 = 30 m/s Length of train = 30 Γ— 5 = 150 metres Desired time = (210 + 150)/(1.20 Γ— 30) = 10 seconds

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