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    Question

    The speed ratio of A to B is 4:3. C covers 840 km in 14

    hours. If B's speed is 20% lower than C's speed, how much time will A need to cover 512 km?
    A 12 hrs Correct Answer Incorrect Answer
    B 8 hrs Correct Answer Incorrect Answer
    C 10 hrs Correct Answer Incorrect Answer
    D 15 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of C = 840/14 = 60 km/hr So, speed of B = 0.8 × 60 = 48 km/hr Therefore, speed of A = (4/3) × 48 = 64 km/hr Therefore, required time = 512/64 = 8 hours

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