Question 1112519
Time for Eric:  x
Time for Jackson:  x+60
Time for both together:  72
Unit: Minutes
One Job:  Clean a house



{{{1/x+1/(x+60)=1/72}}}
Solve for x.
First step should be multiply left and right sides by  {{{72x(x+60)}}} which is the simplest common denominator.  The rest is for you to do.