Question 563864
Rowing	speed	=x	mph				
current 	speed	=y	mph				
against current x-y		2.00	hours				
withcurrent x+y		2.00	hours				
							
Distance = same=		2000	miles				
t=d/r							
4	/	(	x	-	y	)=	2.00
2	(	x	-	y	)	=	4.00
2	x		-2	y	=	4	....................1
16	/	(	x	+	y	)=	2.00
2.00	(	x	+	y	)	=	4
2.00	x	+	2.00	y	=	16	...............2
Multiply (1) by 	1.00						
Multiply (2) by	1.00						
we get							
2	x	+	-2	y	=	4	
2	x	+	2	y	=	16	
4	x	=	20				
/	4						
x 	=	5	mph	speed of rowing			
							
plug value of x in (1)							
2	x		-2	y	=	4	
10			-2	y	=	4	
-2	y	=	4	-10			
-2	y	=	-6				
	y	=	3	mph	current speed