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      Question

      An individual travels 300 kilometres, part by scooter and

      part by bus. The speed of scooter is 40 km/h and the bus is 80 km/h. If the scooter covers 40% of the route, determine the approximate average speed of the entire trip.
      A 20 km/h Correct Answer Incorrect Answer
      B 67 km/h Correct Answer Incorrect Answer
      C 40 km/h Correct Answer Incorrect Answer
      D 79 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Time taken by scooter = (0.40 Γ— 300) / 40 = 120 / 40 = 3 hours

      Time taken by bus = (0.60 Γ— 300) / 80 = 180 / 80 = 2.25 hours

      Average speed = 300 / (3 + 2.25) = 300 / 5.25 β‰ˆ 57 km/h

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