Question 1193072
<pre>
                    SPEED cans per hour          

ONE MACHINE           1200                        

SECOND MACHINE         900                       
</pre>

The two machines worked together for x hours.  The fast machine worked alone for only 1 hour.


{{{1200*1+(1200+900)*x=8200}}}

-

{{{1200+2100x=8200}}}

{{{2100x=8200-1200}}}

{{{21x=82-12}}}

{{{x=70/21}}}
{{{x=(7*2*5)/(7*3)=10/3}}}

{{{highlight_green(x=3&1/3)}}}{{{hours}}}


TOTAL Time was  {{{highlight(4&1/3)}}} hours.