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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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