Question 578652
Boat  	speed	=x	mph						
current     	speed	=y	mph						
against current , x-y		3	hours						
with current , x+y		1.5	hours						
									
Distance = same=		9	miles						
t=d/r	against	current     							
9.00	/	(	x	-	y	)=	3.00		
9.00	(	x	-	y	)	=	3.00		
3.00	x	-	-3.00	y	=	9.00	....................1		
									
9.00	/	(	x	+	y	)=	1.50		
1.50	(	x	+	y	)	=	9.00		
1.50	x	+	1.50	y	=	9.00	...............2		
Multiply (1) by	1.00								
Multiply (2) by	2.00								
we get									
3.00	x	+	-3.00	y	=	9.00			
3.00	x	+	3.00	y	=	18.00			
6.00	x	=	27.00						
/	6.00								
x	=	4.5	mph						
									
plug value of x in (1)									
3	x		-3	y	=	9			
13.5			-3	y	=	9			
-3	y	=	9	-13.5					
-3	y	=	-4.5						
	y	=	1.5	mph					
	Boat  	4.5	mph						
	current     	1.5	mph						
									
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