Question 570609
Boat speed	=x	mph									
current speed 	3	mph									
											
time with current	0.67	hours									
time against current 	1	hours	

0.67(x+3)=1(x-3)
0.67x+	2.00	=1x-3				
1	x	-0.67	x	=	2	+	3			
0.33	x  	=	5							
x 	=	15	mph	Boat speed