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 ->
Percentage-and-ratio-word-problems
-> 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
Log On
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
