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      Question

      A car travels from town P to town Q at 60 km/h and

      returns from Q to P at 40 km/h. What is the average speed for the whole journey?
      A 25 km/h Correct Answer Incorrect Answer
      B 48 km/h Correct Answer Incorrect Answer
      C 32 km/h Correct Answer Incorrect Answer
      D 62 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let distance P–Q = D. Time forward = D/60, time return = D/40 Total distance = 2D Total time = D/60 + D/40 = (2D + 3D)/120 = 5D/120 = D/24 Average speed = Total distance ÷ Total time = 2D ÷ (D/24) = 2D × 24/D = 48 km/h

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