Question 868814
Plane	speed	=x	mph					
wind  	speed	=y	mph					
against  	wind  	2	hours					
with	wind  	2	hours					
								
Distance against 		170	miles	distance with 		280	miles	
t=d/r	against	wind  		-				
170.00	/	(	x	-	y	)=	2.00	
2.00	(	x	-	y	)	=	2.00	
2.00	x	-	2.00	y	=	170.00	....................1	
								
280.00	/	(	x	+	y	)=	2.00	
2.00	(	x	+	y	)	=	280.00	
2.00	x	+	2.00	y	=	280.00	...............2	
Multiply (1) by	1.00							
Multiply (2) by	1.00							
we get								
2.00	x	+	-2.00	y	=	170.00		
2.00	x	+	2.00	y	=	280.00		
4.00	x	=	450.00					
/	4.00							
x	=	112.50	mph					
								
plug value of x in (1)				y				
2.00	x		-2.00	y	=	170.00		
225.00			-2.00	-225.00	=	170.00		
-2.00	y	=	170.00					
-2.00	y	=	-55.00	mph				
	y	=	27.50					
Plane	speed	112.50	mph					
wind  	speed	27.50	mph					
								
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