Question 548560
Boat  	speed	=x	mph						
current 	speed	=y	mph						
against current , x-y		4	hours						
with current , x+y		4	hours						
									
Distance = same=		2000	miles						
t=d/r	against	current 							
28	/	(	x	-	y	)=	4.00		
4	(	x	-	y	)	=	28.00		
	With	current 							
4	x		-4	y	=	28	....................1		
60	/	(	x	+	y	)=	4.00		
4.00	(	x	+	y	)	=	60		
4.00	x	+	4	y	=	60	...............2		
Multiply (1) by 	1.00								
Multiply (2) by	1.00								
we get									
4	x	+	-4	y	=	28			
4	x	+	4	y	=	60			
8	x	=	88						
/	8								
x 	=	11	mph						
									
plug value of x in (1)									
4	x		-4	y	=	28			
44			-4	y	=	28			
-4	y	=	28	-44					
-4	y	=	-16						
	y	=	4	mph					
	Boat  	11	mph						
	current 	4	mph						
									
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