Question 933794
boat 	speed	=x	mph					
current      	speed	=y	mph					
against  	current      	3	hours					
with	current      	2	hours					
								
Distance against 		48	miles	distance with 		48	miles	
t=d/r	against	current      		-				
48.00	/	(	x	-	y	)=	3.00	
3.00	(	x	-	y	)	=	2.00	
3.00	x	-	3.00	y	=	48.00	....................1	
								
48.00	/	(	x	+	y	)=	2.00	
2.00	(	x	+	y	)	=	48.00	
2.00	x	+	2.00	y	=	48.00	...............2	
Multiply (1) by	2.00							
Multiply (2) by	3.00							
we get								
6.00	x	+	-6.00	y	=	96.00		
6.00	x	+	6.00	y	=	144.00		
12.00	x	=	240.00					
/	12.00							
x	=	20.00	mph					
								
plug value of x in (1)				y				
3.00	x		-3.00	y	=	48.00		
60.00			-3.00	-60.00	=	48.00		
-3.00	y	=	48.00					
-3.00	y	=	-12.00	mph				
	y	=	4.00					
boat 	speed	20.00	mph					
current      	speed	4.00	mph					
								
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