Answer:
25 days
Explanation:
If 6 men each work for 5 hours a day: 6 x 5 = 30 hours of work per day
If it takes them 50 days to build the house, then 30 x 50 = 1500 hours work in total to build the house.
If 10 men are working 6 hours a day each: 10 x 6 = 60 hours of work per day.
So 1500 ÷ 60 = 25 days
Therefore, it would take 10 men 25 days to build a house if they were each working 6 hours per day.