# 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**.