Algebra
posted by Brian .
jose can complete the job in a hours, and Maria can complete the job in b hours. How long does it take them to complete the job when they work together? I need a formula

Jose's rate = job/a
Maria's rate = job/b
combined rate = job/a + job/b
= job(a+b)/(ab)
combined time = job/combined rate
= job/[job(a+b)/(ab)]
= ab/(a+b)
Respond to this Question
Similar Questions

MATH
An application of a rational function is T = (AB)/(A+B), which gives the time, T, it takes for two workers to complete a particular task where A & B represent the time it would take for each individual worker to complete the identical … 
math
if you do a job in 4 hours, and your friend can do the same job but in 6 hours, and if you both work together how long will it take to complete the job? 
college algebra
sammy can complete programming job in 8 hours alone. marilyn can complete programming job in 12 hours alone. how many hours would it take if sammy and marilyn work together 
algebra
Sammy can complete a programming job in 8 hours if he works alone. Marilyn can complete the same programming job in 12 hours if she works alone. If Sammy and Marilyn work together, how many hours and minutes will they complete the … 
College Algebra
It takes Todd 3 hours longer than Tom to paint a 4x5 feet bedroom. Working together, both can complete the job in two hours.How long does it take each one to complete the painting job working alone? 
math
Alex takes 3 hours longer to complete a certain job than Barry does. If they can complete the job by working together in 3.6 hours, how long would it take Alex to complete the job working alone? 
Math
Alice can complete a certain job in 5 hours she had been working on the job for two hours when a friend came along. And helped her finish together they completed the job in 1 hr how long would it take alices friend to complete a job … 
College Algebra
Tammy can do a certain job in 6 hours. Kris can do the same job in 8 hours. If Tammy and Kris work together to complete the same job, how many hours will it take for them to complete it? 
Math
an irrigation pump can do a job 3 times faster than another. If the y work together it takes 9 hours to complete the job. How long would it take the larger pump by itself 
SAT Math Question?
Lindsey and Stephen work at a factory. Lindsey can complete one full job in three hours, and Stephen can complete the same job in five hours. If Lindsey and Stephen work together on the job for one hour, then how long, in minutes, …