intermediate algebra
posted by ROCKY .
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.

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. 
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. 
can you please help find the solution to this equation. Your help would be greatly appreciated