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    Question

    The speed ratio of Y and Z is 5 : 4. If Y increases his

    speed by 25%, he can cover 300 km in 4 hours. How long will Z take to travel 192 km?
    A 2 hrs Correct Answer Incorrect Answer
    B 4 hrs Correct Answer Incorrect Answer
    C 8 hrs Correct Answer Incorrect Answer
    D 6 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Increased speed of Y = (300/4) = 75 km/hr So, actual speed of Y = 75 ÷ 1.25 = 60 km/hr Or, speed of Z = 60 × (4/5) = 48 km/hr Therefore, required time = (192/48) = 4 hours

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