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      Question

      A man travelled a total distance of 360 km. He travelled

      first 280 km on car with a speed of 25 km/h and rest of the distance on bike whose speed is 15 km/h less than that of the car. Find his average speed for the whole journey.
      A 10.75 km/h Correct Answer Incorrect Answer
      B 16.75 km/h Correct Answer Incorrect Answer
      C 18.75 km/h Correct Answer Incorrect Answer
      D 17.75 km/h Correct Answer Incorrect Answer

      Solution

      Total time taken to cover the whole journey = 280/25 + 80/10 = 11.2 + 8 = 19.2 km Desired average speed = 360/19.2 = 18.75 km/h

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