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    Question

    A person completes a journey in 300 minutes by train at a

    speed of 60 km/h. What should be his speed by bus to cover the same distance in 7 hours?
    A 60.60 km/h Correct Answer Incorrect Answer
    B 54.55 km/h Correct Answer Incorrect Answer
    C 42.86 km/h Correct Answer Incorrect Answer
    D 30.05 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    When distance is constant,

    Time ∝ 1/Speed

    7 hours = 7 × 60 = 420 minutes

    (Speed of train) ÷ (Speed of bus) = 420 ÷ 300 = 7:5

    Speed of bus = (5/7) × 60 = 42.86 km/h

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