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  1. A person takes 20 minutes more to cover a certain distance by decreasing his speed by 20%. What is the time taken to cover the distance at his original speed?
    2. A.
    1 hour 30 minutes
    B.
    1 hour 15 minutes
    C.
    1 hour 20 minutes
    D.
    2 hours
    E.
    1 hour 45 minutes

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    Answer : Option C

    Explanation :

    Let the distance and original speed be d km and k kmph respectively.

    d/0.8k - d/k = 20/60 => 5d/4k - d/k = 1/3

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