Question 1056785
<pre>
WHICHPUMP    RATE

FIRSTPUMP     {{{1/36}}}

SECONDPUMP    {{{1/18}}}

COMBINED     {{{1/36+1/18}}}
</pre>

The pumps in arrangement used, emptied 1 pool.  Volume unit is in "pools".


{{{system((1/36+1/18)*t=1/3,(1/36)*x=2/3)}}}


total time to do all the emptying would be {{{t+x}}}; and each variable is solvable.