Question 581128
swimming	speed	=x	mph					
current     	speed	=y	mph					
againstcurrent x-y		8	minutes					
with current x+y		4	minutes					
								
Distance = 		200	m 		distance=		200	
t=d/r	against	current     						
200.00	/	(	x	-	y	)=	8.00	
								
8.00	x		-8.00	y	=	200.00	....................1	
								
200.00	/	(	x	+	y	)=	4.00	
4.00	(	x	+	y	)	=	200.00	
4.00	x	+	4.00	y	=	200.00	...............2	
Multiply (1) by	1.00							
Multiply (2) by	2.00							
we get								
8.00	x		-8.00	y	=	200.00		
8.00	x	+	8.00	y	=	400.00		
16.00	x	=	600.00					
/	16.00							
x	=	37.5	Meters /minute					
								
plug value of x in (1)								
8	x		-8	y	=	200		
300			-8	y	=	200		
-8	y	=	200	-300				
-8	y	=	-100					
	y	=	12.5	Meters / minute				
	swimming speed	37.5	Meters /minute	(0.63m/s)				
	current  current   	12.5	Meters /minute	(0.21m/s)