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      Question

      A train of length 480 metres crosses a man standing on

      platform in 24 seconds. If its speed decreases by 25%, then find the time taken by train to cross a platform of length 720 metres.
      A 70 seconds Correct Answer Incorrect Answer
      B 75 seconds Correct Answer Incorrect Answer
      C 80 seconds Correct Answer Incorrect Answer
      D 85 seconds Correct Answer Incorrect Answer
      E 90 seconds Correct Answer Incorrect Answer

      Solution

      Speed of train = (480 ├╖ 24) = 20 m/s New speed of train = 0.75 ├Ч 20 = 15 m/s Required time = (480 + 720) ├╖ 15
      = 1200 ├╖ 15
      = 80 seconds

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