Question 1200740
This kind or similar come up every few weeks.
{{{SPRINKERRATE*TIME=VOLUME}}}
Time is in hours, and volume in liters.

<pre>
           RATE             TIME            VOLUME

YOUNG        r               40              (r)(40)

KIM         65-r             25            (65-r)(25)

TOTAL       65                               2075
</pre>
Create the volume sum equation, and solve....