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      Question

       A train travels the first 120 km at a speed of 40 km/h

      and the next 180 km at a speed of 60 km/h. What is the average speed of the train for the entire journey?
      A 20 km/h Correct Answer Incorrect Answer
      B 45 km/h Correct Answer Incorrect Answer
      C 62 km/h Correct Answer Incorrect Answer
      D 50 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance = 120 + 180 = 300 km Time for first 120 km = 120 ÷ 40 = 3 hours Time for next 180 km = 180 ÷ 60 = 3 hours Total time = 3 + 3 = 6 hours Average speed = Total distance ÷ Total time = 300 ÷ 6 = 50 km/h

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