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    Question

    The speeds of Y and Z are in the ratio 4 : 3. If Y

    raises his speed by 10% and manages to cover 198 km in 3 hours, determine the time taken by Z to travel 225 km.
    A 3 hrs Correct Answer Incorrect Answer
    B 4 hrs Correct Answer Incorrect Answer
    C 8 hrs Correct Answer Incorrect Answer
    D 5 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Increased speed of Y = (198/3) = 66 km/hr
    So, actual speed of Y = 66 Ă· 1.10 = 60 km/hr
    Or, speed of Z = 60 Ă— (3/4) = 45 km/hr
    Therefore, required time = (225/45) = 5 hours

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