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    Question

    Working 6 hours a day, Rahul can complete a work in 25

    days. How many hours a day should he work to complete the same work in 15 days?
    A 10 hrs Correct Answer Incorrect Answer
    B 16 hrs Correct Answer Incorrect Answer
    C 12 hrs Correct Answer Incorrect Answer
    D 24 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the efficiency of Rahul be 'x' units per hour

    Therefore, total work = 6 Ă— 25 Ă— x = 150x units

    Let the time he should work to complete the work in 15 days be 'y' hours a day.

    ATQ;

    150x = 15 Ă— y Ă— x

    Or, y = 10

    Therefore, he should work for 10 hours a day.

    Alternate solution:

    Required time = (6 Ă— 25) Ă· 15 = 10 hours

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