Posted by ROCKY on .
Rowing. Abby rows 10km. upstream and 10km. back in a total time of three hours. The speed of the river is 5km./h. Find Abby's speed in still water.

intermediate algebra 
Reiny,
I just answered a very similar question here:
http://www.jiskha.com/display.cgi?id=1312332711
Study the solution and see if you can apply it to your question. 
intermediate algebra 
Reiny,
Also I just noticed that the same question was answered here:
http://www.jiskha.com/display.cgi?id=1312075836
All you have to do is solve the equation at the end. 
intermediate algebra 
ROCKY,
can you please help find the solution to this equation. Your help would be greatly appreciated