Question 839565
Use the fill rates as amount of tank per amount of time, so you would have the filler as 1/9 tanks per hour, and the drain as {{{-1/11}}} tanks per hour, IF it were fully open.


Filling Rate is this, if the filler is fully open and drainer is HALF open:
{{{1/9-1/22}}} tankfulls per hour
{{{22/198-9/198}}}
{{{highlight_green(13/198)}}} tankfulls per hour.
This assumes that half-open drainer means half the drain rate for that opening.


{{{Rate*Time=Tank}}}
Uniform rate equation to do a particular job on a tank; in this case, filling it according to the conditions described.


{{{highlight((13/198)*t=1)}}}
Solve for t, the time to fill this tank with the drain being half opened.



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