Question 889689
Uniform Rates of each mason:
{{{1/8}}} and {{{1/12}}} in unit of {{{foundation/hour}}}.


Basic uniform rate idea is RT=J rate time job.


Let h = time in hours for the second mason to finish after the first mason stops.  The two masons do not work simultaneously.


{{{highlight_green((1/8)4+(1/12)h=1)}}}.
Solve for h.