Question 887978
Just rely on uniform rates concept RT=J variables for rate, time, job.  Your two agents work at rates of
a, {{{1/x}}}
b, {{{1/(x+16)}}}
Combined rate {{{1/15}}}
Unit for the rate being "Pieces of work per day".


The rates for both a and b working together are just combined with addition.
{{{highlight(1/x+1/(x+16)=1/15)}}}
so solve for x using this equation.