Question

If 5 men dig a hole in 5 hours, how long will it take 2 men to dig half a hole?

Answer 1

Explanation:

5 men do 1 unit of work in 1 hr. 1 man does 1/5 unit of work in 1 hr. 2 men do 2/5 units of work in 1 hr. Therefore 2 men will take 5/2 hours to dig 1 hole and take 5/4 hrs to dig half a hole.