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    Question

    Driving at 3/5 of my original speed I am 4 hours late

    for my office. What is my original time taken (km/h)?
    A 2 hr Correct Answer Incorrect Answer
    B 10 hr Correct Answer Incorrect Answer
    C 12 hr Correct Answer Incorrect Answer
    D 8 hr Correct Answer Incorrect Answer

    Solution

    ∴ Ratio of my speed = 5 : 3 Ratio of time taken = 3 : 5 Let my oroginal and present time taken be 3x and 5x ∴ 5x - 3x = 4 ⇒x = 2 ∴Actual time = 5x = 5 × 2 = 10 hrs

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