Question 428106
boat speed		x	mph				
current speed 		3	mph				
..							
against current		x	-	3	mph		
with current		x   	+	3	mph		
							
Distance upstream=		5					
Distance downstream=		11					
Time = same							
5	/(x-	3	)=	11	/(x+	3	)
5	*(x+	3	)=	11	*(x-	3	)
5	x  	+	15	=	11	x	-33
11	x  	-5	x   	=	33	+	15
6	x  	=	48				
/	6						
	x=	8	mph