Question 489516
boat  	speed	=x	mph					
current  	speed	=y	mph					
against current x-y		0.40	hours					
with current x+y		0.22	hours					
								
Distance = same=		1	miles					
t=d/r								
1	/	(	x	-	y	)=	0.40	
0.4	(	x	-	y	)	=	1.00	
0.4	x		-0.4	y	=	1	....................1	
1	/	(	x	+	y	)=	0.22	
0.22	(	x	+	y	)	=	1	
0.22	x	+	0.22	y	=	1	...............2	
Multiply (1) by 	0.22							
Multiply (2) by	0.40							
we get								
0.09	x	+	-0.09	y	=	0.22		
0.09	x	+	0.09	y	=	0.4		
0.17	x	=	0.62					
/	0.17							
x 	=	3.55	mph					
								
plug value of x in (1)								
0.4	x		-0.4	y	=	1		
1.42			-0.4	y	=	1		
-0.4	y	=	1	-1.42				
-0.4	y	=	-0.42					
	y	=	1.05	mph