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      Question

      A car travels from City A to City B, which is 240 km

      apart. It travels the first 120 km at a speed of 60 km/h and the remaining distance at a speed of 80 km/h. Calculate the average speed of the car for the entire trip.
      A 68.5 km/h Correct Answer Incorrect Answer
      B 70 km/h Correct Answer Incorrect Answer
      C 72 km/h Correct Answer Incorrect Answer
      D 75 km/h Correct Answer Incorrect Answer

      Solution

      Time for the first 120 km = 120 / 60 = 2 hours. Time for the next 120 km = 120 / 80 = 1.5 hours. Total distance = 240 km. Total time = 2 + 1.5 = 3.5 hours. Average speed = Total distance / Total time = 240 / 3.5 = 68.57 km/h (approx). Correct answer: A) 68.5 km/h

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