Question 877130
Try this:


A boat traveled d miles downstream and back. The trip downstream took v hours. The trip back took u hours. Find the speed of the boat in still water and the speed of the current. 


Let r = speed without current
Let c = speed of the current
RT=D uniform rate for travel, Rate, Time, Distance


_________________speed________time_______distance____Equations
DOWN_____________r+c__________v__________d__________{{{(r+c)v=d}}}
UP_______________r-c__________u__________d__________{{{(r-c)u=d}}}


Only two unknown variables:  r and c.
Solve for r and c.