R=rate of boat in still water c=rate of current d=rt since you're given that the time it takes to travel the same distance downstream and upstream, your equation will be d_1=d_2, or rt=rt the rate upstream is r-c and the rate downstream is r+c (because the boat's and river's rates add up) since you know t_1 and t_1 are 5 and 3, you can now set up 2 equations <u>5*(r-c)=45</u> because (time upstream)*(rate upstream)=distance=45 miles r-c=45/5=9 <u>3*(r+c)=45</u> r+c=45/3=15 r-c=9 and r+c=15, so r=12 mi/h and c=3 mi/h If you have any questions please ask
