Question 955974
One job is "paint the neighbor's house".
Basic idea, RT=J
R, workrate
T, time
J, amount of job

<pre>
PERSON      RATE        TIME        JOB
  A          5r                      1
  B          r                       1
 both       1/7          7           1
</pre>
{{{5r+r=1/7}}}, their rates combined working together


{{{6r=1/7}}}

{{{highlight(r=1/42)}}}, person B would need 42 days, working alone.

{{{5/42}}}{{{jobs/day}}}, about {{{highlight(8.4)}}} days person A would need working alone.