Question 612506
Boat  	speed	x	mph					
current     	speed	6	mph					
..								
against	current     	x	-	6	mph			
with	current     	x   	+	6	mph			
								
Distance against	current     	12						
Distance with	current     	16						
Time = same	equate the time against with time with current							
t=d/r								
12	/(x-	6	)=	16	/(x+	6	)	
12	*(x+	6	)=	16	*(x-	6	)	
12	x  	+	72	=	16	x	-96	
12	x  	-16	x   	=	-96	+	-72	
-4	x  	=	-168					
/	-4							
	x=	42	mph					
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