Question 633053
Boat  	speed	=x	mph					
current     	speed	=y	mph					
againstcurrent x-y		10	hours				
with current x+y		5	hours				
								
Distance = 		120	miles 		distance=		120	
t=d/r	against	current     						
120.00	/	(	x	-	y	)=	10.00	
								
10.00	x	-	-10.00	y	=	120.00	....................1	
downstream								
120.00	/	(	x	+	y	)=	5.00	
5.00	(	x	+	y	)	=	120.00	
5.00	x	+	5.00	y	=	120.00	...............2	
Multiply (1) by	1.00							
Multiply (2) by	2.00							
we get								
10.00	x	+	-10.00	y	=	120.00		
10.00	x	+	10.00	y	=	240.00		
20.00	x	=	360.00					
/	20.00							
x	=	18	mph					
								
plug value of x in (1)								
10	x		-10	y	=	120		
180			-10	y	=	120		
-10	y	=	120	-180				
-10	y	=	-60					
	y	=	6	mph				
	Boat  	18	mph					
	current     	6	mph					
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