Question 709181
Same job, each worker different rates.

{{{R[a]}}} Amys' rate
{{{R[t]}}} Toms' rate  (Our unknown variable to find)
{{{R[s]}}} Sum of their rates working together


{{{R[a]+R[t]=R[s]}}}
From given,
{{{1/9+R[t]=1/5}}}
{{{R[t]=1/5-1/9}}}
{{{R[t]=(9-5)/45}}}
{{{highlight(R[t]=4/45)}}}, as jobs per hour.


If you want as how many HOURS per JOB, then use reciprocal.
{{{highlight(45/4=11&1/4)}}}, hours per job.