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      Question

      A giant circular wheel has a diameter of 28 metres. In

      how many revolutions will the wheel cover a total of 11 km?
      A 120 Correct Answer Incorrect Answer
      B 135 Correct Answer Incorrect Answer
      C 125 Correct Answer Incorrect Answer
      D 145 Correct Answer Incorrect Answer

      Solution

      Radius of the giant wheel = 28 รท 2 = 14 metres Circumference of the giant wheel = 2 ร— ฯ€ ร— radius = 2 ร— (22/7) ร— 14 = 88 metres So, number of rotations to cover 11 km i.e. 11000 metres = 11000 รท 88 = 125

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