Question 818452
boat   	speed	=x	km/h					
current     	speed	=y	km/h					
against  	current     	4	hours					
with	current     	3	hours					
								
Distance against 		192	miles	distance with 		192	miles	
t=d/r	against	current     		-				
192.00	/	(	x	-	y	)=	4.00	
4.00	(	x	-	y	)	=	3.00	
4.00	x	-	4.00	y	=	192.00	....................1	
								
192.00	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	192.00	
3.00	x	+	3.00	y	=	192.00	...............2	
Multiply (1) by	3.00							
Multiply (2) by	4.00							
we get								
12.00	x	+	-12.00	y	=	576.00		
12.00	x	+	12.00	y	=	768.00		
24.00	x	=	1344.00					
/	24.00							
x	=	56.00	mph					
								
plug value of x in (1)				y				
4.00	x		-4.00	y	=	192.00		
224.00			-4.00	-224.00	=	192.00		
-4.00	y	=	192.00					
-4.00	y	=	-32.00	km/h				
	y	=	8.00					
boat   	speed	56.00	km/h					
current     	speed	8.00	km/h					
								
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