Question 863515
Plane	speed	=x	mph					
current     	speed	=y	mph					
against  	wind	6	hours					
with	wind	4.5	hours					
								
Distance against 		1800	miles	distance with 		1800	miles	
t=d/r	against	wind		-				
1800.00	/	(	x	-	y	)=	6.00	
6.00	(	x	-	y	)	=	4.50	
6.00	x	-	6.00	y	=	1800.00	....................1	
								
1800.00	/	(	x	+	y	)=	4.50	
4.50	(	x	+	y	)	=	1800.00	
4.50	x	+	4.50	y	=	1800.00	...............2	
Multiply (1) by	4.50							
Multiply (2) by	6.00							
we get								
27.00	x	+	-27.00	y	=	8100.00		
27.00	x	+	27.00	y	=	10800.00		
54.00	x	=	18900.00					
/	54.00							
x	=	350.00	mph					
								
plug value of x in (1)				y				
6.00	x		-6.00	y	=	1800.00		
2100.00			-6.00	-2100.00	=	1800.00		
-6.00	y	=	1800.00					
-6.00	y	=	-300.00	mph				
	y	=	50.00					
Plane	speed	350.00	mph					
current     	speed	50.00	mph					
								
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