SOLUTION: A. can do a job in 2 hours. B. can do a job in 1 hours. If they both work together, how long will it take them to the job? PLEASE HELP ME!!!

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A. can do a job in 2 hours. B. can do a job in 1 hours. If they both work together, how long will it take them to the job? PLEASE HELP ME!!!      Log On


   

Question 215772: A. can do a job in 2 hours.
B. can do a job in 1 hours.
If they both work together, how long will it take them to the job?
PLEASE HELP ME!!!
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
If A can do the job in 2 hours (that's 120 minutes), then A can do 1%2F120 of the job in one minute.
If B can do the job in 1 hour(that's 60 minutes) then B can can do 1%2F60 of the job in one minute.
Working together, they can do 1%2F120%2B1%2F60+=+1%2F40 of the job in one minute, which means that they can do the entire job in 40 minutes.