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    Question

    The ratio of the speeds of Karan and Arjun is 7:5

    respectively. Manoj covers a distance of 840 km in 14 hours. If Arjun’s speed is 20% less than Manoj’s speed, how much time will Karan take to cover 672 km?
    A 18 hrs Correct Answer Incorrect Answer
    B 14 hrs Correct Answer Incorrect Answer
    C 15 hrs Correct Answer Incorrect Answer
    D 10 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of Manoj = 840/14 = 60 km/hr

    So, speed of Arjun = 0.8 × 60 = 48 km/hr

    Therefore, speed of Karan = (7/5) × 48 = 67.2 km/hr

    Therefore, required time = 672/67.2 = 10 hours

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