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      Question

      A train of length 300 metres crosses a man standing on

      platform in 15 seconds. If its speed decreases by 20%, then find the time taken by train to cross a platform of length 420 metres.
      A 40 seconds Correct Answer Incorrect Answer
      B 45 seconds Correct Answer Incorrect Answer
      C 48 seconds Correct Answer Incorrect Answer
      D 52 seconds Correct Answer Incorrect Answer
      E 50 seconds Correct Answer Incorrect Answer

      Solution

      Speed of train = (300 ÷ 15) = 20 m/s New speed of train = 0.8 × 20 = 16 m/s Required time = (300 + 420) ÷ 16
      = 720 ÷ 16
      = 45 seconds

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