Question 930542
boat   	speed	x	mph	with no	current     		
current     	speed	4	mph				
							
against	current     	x	-	4	mph		
with	current     	x   	+	4	mph		
							
Distance against	current     	3					
Distance with	current     	11					
Time = same	equate the time against with time with current						
t=d/r							
3	/(x-	4	)=	11	/(x+	4	)
3	*(x+	4	)=	11	*(x-	4	)
3	x  	+	12	=	11	x	-44
3	x  	-11	x   	=	-44	+	-12
-8	x  	=	-56				
/	-8						
	x=	7	mph				
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