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      Question

      A giant circular wheel has a diameter of 14 metres. In

      how many revolutions will the wheel cover a total of 4.4 km?
      A 110 Correct Answer Incorrect Answer
      B 120 Correct Answer Incorrect Answer
      C 130 Correct Answer Incorrect Answer
      D 100 Correct Answer Incorrect Answer

      Solution

      Radius of the giant wheel = 14 ÷ 2 = 7 metres Circumference of the giant wheel = 2 × π × radius = 2 × (22/7) × 7 = 44 metres So, number of rotations to cover 4.4 km i.e. 4400 metres = 4400 ÷ 44 = 100

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