Question 740273
tugboat	speed	=x	mph							
current     	speed	=y	mph							
against  	current     	10	hours							
with	current     	5	hours							
										
Distance against 		100	miles	distance with 		100	miles			
t=d/r	against	current     		-						
100	/	(	x	-	y	)=	10			
10	(	x	-	y	)	=	100			
10	x	-	10	y	=	100	....................1			
										
100	/	(	x	+	y	)=	5			
5	(	x	+	y	)	=	100			
5	x	+	5	y	=	100	...............2			
Multiply (1) by	1    									
Multiply (2) by	2									10
we get										
10	x	+	-10	y	=	100				
10	x	+	10	y	=	200				
20	x	=	300							
/	20									
x	=	15.00	mph							
										
plug value of x in (1)				y						
10	x		-10	y	=	100				
150			-10	-150	=	100				
-10	y	=	100							
-10	y	=	-50	mph						
	y	=	5.00							
tugboat	speed	15.00	mph							100
current     	speed	5.00	mph							100
										
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