Multiple Choice Questions on It takes 6 workers a total of 10 hours to assemble a computer with each working at the same rate If ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

It takes 6 workers a total of 10 hours to assemble a computer with each working at the same rate If ...........

Quant (SSC) Time and work
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    It takes 6 workers a total of 10 hours to assemble a computer, with each working at the same rate. If six workers start at 9.00 am, and one worker per hour is added beginning at 3.00 pm, at what time will the computer assembled?

    5.00 pm

    Incorrect Answer

    5.30 pm

    Incorrect Answer

    6.00 pm

    Correct Answer

    7.00 pm

    Incorrect Answer
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    Explanation:
    6 workers complete some work in 10 hours.
    ∴  1 worker completes the same work in 60 hours.
    Let the total work be equivalent to 60 man-hours.
    From 9.00 am to 3.00 pm, all 6 workers work together for 6 hours.
    ∴   Amount of work done by 6 workers in 6 hours is 6 × 6 = 36 man-hours
    From 3.00 pm to 4.00 pm, 7 man-hours of work will be done.
    From 4.00 pm to 5.00 pm, 8 man-hours of work will be done.
    From 5.00 pm to 6.00 pm, 9 man-hours of work will be done.
    Thus, total amount of work done up to 6.00 pm is 36 + 7 + 8 + 9 = 60 man-hours
    Thus, the computer will be assembled at 6.00 pm

    By: Amit Kumar
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