Question 866166
boat   	speed	=x	mph					
current     	speed	=y	mph					
against  	current     	1.5	hours					
with	current     	1	hours					
								
Distance against 		30	miles	distance with 		30	miles	
t=d/r	against	current     		-				
30.00	/	(	x	-	y	)=	1.50	
1.50	(	x	-	y	)	=	1.00	
1.50	x	-	1.50	y	=	30.00	....................1	
								
30.00	/	(	x	+	y	)=	1.00	
1.00	(	x	+	y	)	=	30.00	
1.00	x	+	1.00	y	=	30.00	...............2	
Multiply (1) by	1.00							
Multiply (2) by	1.50							
we get								
1.50	x	+	-1.50	y	=	30.00		
1.50	x	+	1.50	y	=	45.00		
3.00	x	=	75.00					
/	3.00							
x	=	25.00	mph					
								
plug value of x in (1)				y				
1.50	x		-1.50	y	=	30.00		
37.50			-1.50	-37.50	=	30.00		
-1.50	y	=	30.00					
-1.50	y	=	-7.50	mph				
	y	=	5.00					
boat   	speed	25.00	mph					
current     	speed	5.00	mph					
								
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