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      Question

      Sunil covered 50% of his journey at 90 km/h and rest at

      150 km/h. Determine the average speed of Sunil during the entire journey.
      A 142.5 km/h Correct Answer Incorrect Answer
      B 112.5 km/h Correct Answer Incorrect Answer
      C 102.5 km/h Correct Answer Incorrect Answer
      D 132.5 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      We know that when distance covered is equal, then average speed is harmonic mean of both speeds. So, average speed = [(2 × 90 × 150)/(150 + 90)] = 112.5 km/h

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