SOLUTION: melanie can do a job in 4 hours. kim can do the same job in 6 hours. if they work together, how long will it take to complete the job?

Question 307837: melanie can do a job in 4 hours. kim can do the same job in 6 hours. if they work together, how long will it take to complete the job?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
melanie can do a job in 4 hours
so she can do 1/4 of the job in 1 hour
Kim does the same job in 6 hours
So he can do 1/6 job in 1 hour
Together they can do 1/4 + 1/6 of the job in 1 hour
1/4 + 1/6
= 3+2 / 12
= 5/12 job in one hour
so 1 job they will do together in 12/5 hours
= 2.4 hours
RELATED QUESTIONS
John can do a job in 4 hours and Mark can do the same job in 2 hours. If they work... (answered by Cromlix)

Thomas can do a job in 4 hours. Julia can do the same job in 6 hours. How many hours... (answered by fractalier)

Tomas can do a job in 4 hours. Julia can do the same job in 6 hours. How many hours will... (answered by solver91311)

george can do a job in 6 hours and john can do the same job in 4 hours. how long will it... (answered by nerdybill)

Tom can do a job in 4 hours, Joy can do the same job in 3 hours, How many hours will it... (answered by josmiceli)

Joy can do a job in 7 hours, while it takes Lucy only 5 hours to do same job. How long... (answered by ankor@dixie-net.com)

You can do a job in 4 hours and a co-worker can do the same job in 8 hour. How long will... (answered by jorel1380)

Mr. Santos can mow his lawn in 4 hours. Mr. Cruz can do the same job in 5 hours. How long (answered by ikleyn)