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Man does (1/8) job in 1 hour. Child does (1/12) job in 1 hour.

Working together, they do (1/8 + 1/12) of the job in 1 hour, or (3/24 + 2/24) = 5/24.

(1 job) / (5/24 job per hour) = 24/5 = 4.8 hours = 4hours 48minutes

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Juan accepted a job to roof a new house He can complete the job in 20 hours His trainee takes 25 hours to complete the job How much time should the two of them working together need to roof the house?

It will take about 11.1 hours for the two of them to complete the roofing of the house.


Worker A can complete a job in 20 hours and worker B can complete a job in 25 hours if both workers work together how long will it take them to complete the job?

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.


If 10 people can do a piece of work in 5 days working 2 hours a day how long will 2 people take to do the same work working 5 hours a day?

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 12 hr per day can finish a piece of work in 12 days how many hours per day must be work to complete it in 8 days?

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 accepted a job to paint a new house he calculated that he can complete the job in 30 hours he hired a trainee to assist him he has seen the trainee work and estimates that the trainee working?

Jack estimates that with the trainee helping him paint the house, he can complete the job in 18 hours.

Related Questions

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Juan accepted a job to roof a new house He can complete the job in 20 hours His trainee takes 25 hours to complete the job How much time should the two of them working together need to roof the house?

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What action did the progressives take to help the working poor?

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