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      Question

      A runner completes a track in three segments. For the

      first 'v - 5' km, he runs at 15 km/h, for 'v' km at 25 km/h, and the last 'v + 5' km at 20 km/h. If his average speed is 20 km/h, determine 'v'.
      A 10 Correct Answer Incorrect Answer
      B 20 Correct Answer Incorrect Answer
      C 30 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      ATQ, Given =Β  On solving we get, v = 15

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