It will take about 11.1 hours for the two of them to complete the roofing of the house.
The way to calculate this is to figure out what fraction each does in an hour (1/20 of the job, vs. 1/25 of the job). Add the fractions together to see how much they do together in an hour, then take the reciprocal to find out how many hours it takes them.
First, calculate the total work done in hours: 10 people working 2 hours a day for 5 days equals 100 person-hours (10 people × 2 hours/day × 5 days). If 2 people work 5 hours a day, they complete 10 person-hours each day (2 people × 5 hours/day). To find out how many days it would take them to complete 100 person-hours, divide 100 by 10, which equals 10 days. Thus, 2 people will take 10 days to complete the same work working 5 hours a day.
If a man working 6 hours per day can complete a piece of work in 12 days, the total work done is 6 hours/day × 12 days = 72 hours. To finish the same work in 8 days, he needs to work 72 hours ÷ 8 days = 9 hours per day. Therefore, he must work 9 hours per day to complete the task in 8 days.
Jack estimates that with the trainee helping him paint the house, he can complete the job in 18 hours.
18/7 hrs.
It will take about 11.1 hours for the two of them to complete the roofing of the house.
it will take them 2 hours and a half to work together on the driveways. but it depends on how far the driveways are from each other
Supported limits on working hours Promoted laws against child labor
I'm A child and i know it ,,,,,, its earths is 24 hours and Jupiter's is about 10 hours
Promote laws against child labor Lobby for a national income tax Support limits on working hours
Supported limits on working hours Promoted laws against child labor
Progressives supported limits on working hours, and laws restricting child labor.
Supported limits on working hours Promoted laws against child labor
Supported limits on working hours Promoted laws against child labor
The way to calculate this is to figure out what fraction each does in an hour (1/20 of the job, vs. 1/25 of the job). Add the fractions together to see how much they do together in an hour, then take the reciprocal to find out how many hours it takes them.
4 hours