Question 540712
Canoe	speed	=x	mph					
current     	speed	=y	mph					
against current , x-y		4	hours					
with current , x+y		3	hours					
								
Distance = same=		48	miles					
t=d/r	
Against current							
48	/	(	x	-	y	)=	4.00	
4	(	x	-	y	)	=	48.00	
4	x		-4	y	=	48	....................1

With current	
48	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	48	
3.00	x	+	3.00	y	=	48	...............2	
Multiply (1) by 	3.00							
Multiply (2) by	4.00							
we get								
12	x	+	-12	y	=	144		
12	x	+	12	y	=	192		
24	x	=	336					
/	24							
x 	=	14	mph					
								
plug value of x in (1)								
4	x		-4	y	=	48		
56			-4	y	=	48		
-4	y	=	48	-56				
-4	y	=	-8					
	y	=	2	mph				
	Canoe	14	mph					
	current     	2	mph					
								
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