Question 909352
boat   	speed	=x	mph					
current     	speed	=y	mph					
against  	current     	5	hours					
with	current     	3	hours					
								
Distance against 		20	miles	distance with 		24	miles	
t=d/r	against	current     		-				
20.00	/	(	x	-	y	)=	5.00	
5.00	(	x	-	y	)	=	3.00	
5.00	x	-	5.00	y	=	20.00	....................1	
								
24.00	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	24.00	
3.00	x	+	3.00	y	=	24.00	...............2	
Multiply (1) by	3.00							
Multiply (2) by	5.00							
we get								
15.00	x	+	-15.00	y	=	60.00		
15.00	x	+	15.00	y	=	120.00		
30.00	x	=	180.00					
/	30.00							
x	=	6.00	mph					
								
plug value of x in (1)				y				
5.00	x		-5.00	y	=	20.00		
30.00			-5.00	-30.00	=	20.00		
-5.00	y	=	20.00					
-5.00	y	=	-10.00	mph				
	y	=	2.00					
boat   	speed	6.00	mph					
current     	speed	2.00	mph					
								
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