Question 1095948
r, boat speed in still water
c, speed of current
<pre>
                  SPEED      TIME     DISTANCE

DOWN              r+c        12       168

UP                r-c        14       168

Total                                336
</pre>

{{{system(12(r+c)=168,14(r-c)=168)}}}
Simplify and solve the system for r and c.
Assumed TOTAL distance 336 and half of this is each of the one-way distances.