Question 915210
Boat speed	speed	=x	mph					
current     	speed	=y	mph					
against  	current     	4.5	hours					
with	current     	1.5	hours					
								
Distance against 		13.5	miles	distance with 		13.5	miles	
t=d/r	against	current     		-				
13.50	/	(	x	-	y	)=	4.50	
4.50	(	x	-	y	)	=	1.50	
4.50	x	-	4.50	y	=	13.50	....................1	
								
13.50	/	(	x	+	y	)=	1.50	
1.50	(	x	+	y	)	=	13.50	
1.50	x	+	1.50	y	=	13.50	...............2	
Multiply (1) by	1.50							
Multiply (2) by	4.50							
we get								
6.75	x	+	-6.75	y	=	20.25		
6.75	x	+	6.75	y	=	60.75		
13.50	x	=	81.00					
/	13.50							
x	=	6.00	mph					
								
plug value of x in (1)				y				
4.50	x		-4.50	y	=	13.50		
27.00			-4.50	-27.00	=	13.50		
-4.50	y	=	13.50					
-4.50	y	=	-13.50	mph				
	y	=	3.00					
Boat speed	speed	6.00	mph					
current     	speed	3.00	mph					
								
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