Question 1066003
This is a constant rates problem exercise.


<pre>
                       RATE       TIME(hours       VOLUME(liters)
WONG                    35          w                35w
KELLY                   20          k                20k
TOTAL                               35                925
</pre>


{{{system(w+k=35,35w+20k=925)}}}


The volume sum equation simplified,
{{{7w+4k=185}}}
-
From the time sum, k=35-w.  Substitute this.
{{{7w+4(35-w)=185}}}
{{{7w+4*35-4w=185}}}
{{{3w=185-4*35}}}
{{{3w=45}}}
{{{highlight(w=15)}}}------------Hours for the Wong's.


{{{highlight(k=20)}}}----------hours for the Kelly's.