Question 1141265
Typical Constant Rates problem with two separate uncombined tasks.


<pre>
           RATE           TIME           CALORIES

RUN          12

WALK          5

Totals                      60              580



           RATE           TIME           CALORIES

RUN          12            r              12r

WALK          5            w               5w

Totals                     60             580
</pre>

{{{12r+5w=580}}}
{{{r+w=60}}}
-

{{{12r+5(60-r)=580}}}

{{{12r+300-5r=580}}}

{{{7r=580-300}}}

{{{7r=280}}}

{{{highlight(r=40)}}}------------time in minutes spent running.