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.