Question 998915
canoe 	speed	=x	mph					
current     	speed	=y	mph					
against  	current     	5	hours					
with	current     	3	hours					
								
Distance against 		15	miles	distance with 		15	miles	
t=d/r	against	current     		-				
15	/	(	x	-	y	)=	5	
5	(	x	-	y	)	=	15	
5	x	-	5	y	=	15	....................1	
								
15	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	15	
3.00	x	+	3.00	y	=	15	...............2	
Multiply (1) by	5    							
Multiply (2) by	3							
we get								
25.00	x	+	-25	y	=	75		
9.00	x	+	9	y	=	45		
34	x	=	120					
/	34							
x	=	4	mph					
								
plug value of x in (1)								
5	x		-5	y	=	15		
18			-5	y	=	15		
-5	y	=	15	-18				
-5	y	=	-3	mph				
	y	=	1					
canoe 	speed	4	mph					
current     	speed	1	mph