Question 1015810
Unknown Variables x rate in still water, y rate of river current;
{{{system(p=1.5,n=4,d=12)}}}
<pre>
Meaning of known variables:
p   time done down river
n   time done up river
d   distance each way

                rate        time        distance
DownRiver       x+y          p            d
UpRiver         x-y          n            d
</pre>

RT=D basic travel rate relationship rule relating rate time distance


{{{system((x+y)*p=d,(x-y)*n=d)}}}
Solve this system for x and y.


IF you solve this system all in symbols, then you have a solution which will
fit ALL examples which fit the form of the exercise.