4 men can check exam papers in 8 days working 5 hours regularly. What is the total hours when 2 men will check the double of the papers in 20 days ?



4 men can check exam papers in 8 days working 5 hours regularly. What is the total hours when 2 men will check the double of the papers in 20 days ?

A. 8 hours

B. 9 hours

C. 7 hours

D. 11 hours

Answer : A. 8 hours


Explanation:

    Let a man can do 1 unit of work in 1 hour.

    Total units of work = 4 * 8 * 5 = 160 units.

    Now work = 2 * 160 = 320 units.

    Now 2 men work for 20 days. Let in x hours they have to work per day.

    Now total work = 2 * x * 20 = 40x

    40x = 320

    So x = 320/40

    = 8 hours
    .

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