Question 939009
canoe	speed	=x	km 					
current     	speed	=y	km 					
against  	current     	6	hours					
with	current     	4	hours					
								
Distance against 		18	miles	distance with 		18	km 	
t=d/r	against	current     		-				
18.00	/	(	x	-	y	)=	6.00	
6.00	(	x	-	y	)	=	4.00	
6.00	x	-	6.00	y	=	18.00	....................1	
								
18.00	/	(	x	+	y	)=	4.00	
4.00	(	x	+	y	)	=	18.00	
4.00	x	+	4.00	y	=	18.00	...............2	
Multiply (1) by	4.00							
Multiply (2) by	6.00							
we get								
24.00	x	+	-24.00	y	=	72.00		
24.00	x	+	24.00	y	=	108.00		
48.00	x	=	180.00					
/	48.00							
x	=	3.75	km/h					
								
plug value of x in (1)				y				
6.00	x		-6.00	y	=	18.00		
22.50			-6.00	-22.50	=	18.00		
-6.00	y	=	18.00					
-6.00	y	=	-4.50	km/h				
	y	=	0.75					
canoe	speed	3.75	km/h					
current     	speed	0.75	km/h					
					
With current speed = 3.75+0.75 = 4.5 km/h			
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