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    Question

    A man travelled a total distance of 150 km. He travelled

    first 100 km on car with a speed of 20 km/h and rest of the distance on bike whose speed is 10 km/h less than that of the car. Find his average speed for the whole journey.
    A 12 km/h Correct Answer Incorrect Answer
    B 16 km/h Correct Answer Incorrect Answer
    C 12 km/h Correct Answer Incorrect Answer
    D 15 km/h Correct Answer Incorrect Answer

    Solution

    Total time taken to cover the whole journey = 100/20 + 50/10 = 5 + 5 = 10 km Desired average speed = 150/10 = 15 km/h

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