Question 792079
Plane  	speed	=x	mph					
wind   	speed	=y	mph					
against  	wind   	9	hours					
with	wind   	3	hours					
								
Distance against 		7290	miles	distance with 		3630	miles	
t=d/r	against	wind   		-				
7290.00	/	(	x	-	y	)=	9.00	
9.00	(	x	-	y	)	=	3.00	
9.00	x	-	9.00	y	=	7290.00	....................1	
								
3630.00	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	3630.00	
3.00	x	+	3.00	y	=	3630.00	...............2	
Multiply (1) by	1.00							
Multiply (2) by	3.00							
we get								
9.00	x	+	-9.00	y	=	7290.00		
9.00	x	+	9.00	y	=	10890.00		
18.00	x	=	18180.00					
/	18.00							
x	=	1010.00	mph					
								
plug value of x in (1)				y				
9.00	x		-9.00	y	=	7290.00		
9090.00			-9.00	-9090.00	=	7290.00		
-9.00	y	=	7290.00					
-9.00	y	=	-1800.00	mph				
	y	=	200.00					
Plane  	speed	1010	mph					
wind   	speed	200	mph					
								
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