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      Question

      A giant circular wheel has a diameter of 63 metres. In

      how many revolutions will the wheel cover a total of 79.2 km?
      A 400 Correct Answer Incorrect Answer
      B 420 Correct Answer Incorrect Answer
      C 430 Correct Answer Incorrect Answer
      D 450 Correct Answer Incorrect Answer

      Solution

      Radius of the giant wheel = 63 ÷ 2 = 31.5 metres Circumference of the giant wheel = 2 × π × radius = 2 × (22/7) × 31.5 = 198 metres So, number of rotations to cover 79.2 km i.e. 79200 metres = 79200 ÷ 198 = 400

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