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    Question

    A biker travels first half of his journey with a speed

    of 18 km/h and the other half with a speed of 'x' km/h. If the total distance traveled by him is 180 km and the total time taken is 10 hours, then find the value of 'x'.
    A 15 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 22 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, When the same distance is traveled in two parts, the average speed is given by Average speed= {2xy/(x+y)}, where 'x' and 'y' are the speeds. Average speed of biker = [(2×18×x)/(x+18)]

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