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    Question

    A person covered 80 km at a speed of 'z' km/h and then

    another 100 km at a speed of (3z/2) km/h. If the total time taken for the journey was 320 minutes, find the value of 'z'.
    A 27.5 km/h Correct Answer Incorrect Answer
    B 45.5 km/h Correct Answer Incorrect Answer
    C 56.6 km/h Correct Answer Incorrect Answer
    D 20.5 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Image

    So, z = (440 ├Ч 3) ├╖ (3 ├Ч 16) = 27.5 km/h

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