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      Question

      Initially the diameter of a balloon is 28 cm. It can

      explode when the diameter becomes 5/2 times of the initial diameter. Air is blown at 156 cc/s. It is known that the shape of balloon always remains spherical. In how many seconds the balloon will explode?
      A 1078 s Correct Answer Incorrect Answer
      B 1368 s Correct Answer Incorrect Answer
      C 1087 s Correct Answer Incorrect Answer
      D none of these Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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