Question 1168185
r, boat without current
c, current's speed


<pre>
         SPEED       TIME      DISTANCE
DOWN      r+c         11         176
UPSTR     r-c         22         176
</pre>

Using {{{S=D/T}}}
-
The downstream data gives you  {{{r+c=176/11=16}}}.
The upstream data gives you {{{r-c=176/22=8}}}


This system can easily be solved using Elimination Method:
{{{system(r+c=16,r-c=8)}}}


Add the corresponding members to eliminate c, and quickly find value for r.
Now, any method you like, easily find the value for .


{{{system(highlight(r=12),and,highlight(c=4))}}}