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      Question

      A car covers four successive 3 km stretches at speeds of

      10 km/h, 20 km/h, 30 km/h and 60 km/h, respectively. Its average speed over this distance is:
      A 30 km/h Correct Answer Incorrect Answer
      B 15 km/h Correct Answer Incorrect Answer
      C 20 km/h Correct Answer Incorrect Answer
      D 25 km/h Correct Answer Incorrect Answer

      Solution

      The correct answer is C

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