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      Question

      Ravi drives from city X to city Y at a speed of 40 km/h

      and returns at a speed of 60 km/h. What is his average speed for the whole journey?
      A 54 km/h Correct Answer Incorrect Answer
      B 48 km/h Correct Answer Incorrect Answer
      C 65 km/h Correct Answer Incorrect Answer
      D 78 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Average speed = (2 × 40 × 60) ÷ (40 + 60) = 4800 ÷ 100 = 48 km/h

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