Question 1194917
<pre>
                   SPEEDS      TIMES      DISTANCES
UPSTR              4-c          x          8
DOWNSTR            4+c          x         24
</pre>
{{{x=x}}}
You can figure out what to do next and to finish.



The current, c, is flowing  2 kilometers per hour.



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Recheck and study the previous example.  You will then understand, and will know what to do.