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      Question

      A train 500 m long running at 90 km/hr takes 40 seconds

      to cross a bridge. The length of the bridge is
      A 250 metre Correct Answer Incorrect Answer
      B 450 metre Correct Answer Incorrect Answer
      C 400 metre Correct Answer Incorrect Answer
      D 500 metre Correct Answer Incorrect Answer

      Solution

      Speed of train = 90 km/hr = 90 ร— (5 / 18) = 25 m / sec If the length of bridge be x metre, then โ‡’ 25 = (500 + x)/40 โ‡’ 500 + x = 1000 โ‡’ x = 1000 โ€“ 500 = 500 metre

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