SOLUTION: Karl can mow his lawn in 3 hours. His Brother can do the same job in4 hours. ow long will it take them to do the job if they work together

SOLUTION: Karl can mow his lawn in 3 hours. His Brother can do the same job in4 hours. ow long will it take them to do the job if they work together

Algebra.Com

Question 412380: Karl can mow his lawn in 3 hours. His Brother can do the same job in4 hours. ow long will it take them to do the job if they work together
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Karl can do 1/3 of job in 1 hour
brother can do 1/4 of the job in 1 hour
..
Together they will do 1/3 + 1/4 of the job in 1 hour
...
LCD = 12
they do 7/12 of the job in 1 hour
..
they take 12/7 hours
=1.71 hours
RELATED QUESTIONS
Mr. Santos can mow his lawn in 4 hours. Mr. Cruz can do the same job in 5 hours. How long (answered by ikleyn)

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

It takes Brad 2 hours to mow his lawn. It takes Gail 3 hours to mow the same lawn. How... (answered by scott8148)

sammy can mow a lawn in 3 hours. his two young brothers can each do the job in 2 hours.... (answered by alma11,Alan3354)

sammy can mow a lawn in 3 hours. his two young brothers can each do the job in 2 hours.... (answered by KMST)

A man can mow his lawn in 4 hours. His son can do the job in 3 hours. If the son takes... (answered by VFBundy)

If donald can perfrom a job working alone in 4 hours,and his brother mark can do the same (answered by lwsshak3)

jack usually mows his lawn in 4 hours, Marilyn can mow the same lawn in 3 hours, how long (answered by checkley77)

zach can wash all the windows in his house in 3 hours. His brother COry can do the same... (answered by ankor@dixie-net.com)