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 ?

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