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      Question

      A train 400 m long running at 108 km/hr takes 35 seconds

      to cross a bridge. The length of the bridge is
      A 300 metre Correct Answer Incorrect Answer
      B 425 metre Correct Answer Incorrect Answer
      C 625 metre Correct Answer Incorrect Answer
      D 650 metre Correct Answer Incorrect Answer

      Solution

      Speed of train = 108 km/hr = 108 ร— (5/18) = 30 m / sec If the length of bridge be x metre, then โ‡’ 30 = (400 + x)/35 โ‡’ 400 + x = 1050 โ‡’ x = 1050 โ€“ 400 = 650 metre

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