Question 874839
300	/	(	x	-	y	)=	6	
6	(	x	-	y	)	=	4	
6	x	-	6	y	=	300	....................1	
								
456	/	(	x	+	y	)=	4	
4	(	x	+	y	)	=	456	
4	x	+	4	y	=	456	...............2	
Multiply (1) by	2							
Multiply (2) by	3							
we get								
12	x	+	-12	y	=	600		
12	x	+	12	y	=	1,368		
24	x	=	1,968					
/	24							
x	=	82	mph					
								
plug value of x in (1)				y				
6	x		-6	y	=	300		
492			-6	-492	=	300		
-6	y	=	300					
-6	y	=	-192	mph				
	y	=	32					
boat   	speed	82	mph					
current     	speed	32	mph