Question 728863
Plane  	speed	=x	mph					
wind   	speed	=y	mph					
against  	wind   	3	hours					
with	wind   	2	hours					
								
Distance against 		1650	miles	distance with 		1300	miles	
t=d/r	against	wind   		-				
1650	/	(	x	-	y	)=	3	
3	(	x	-	y	)	=	1650	
3	x	-	3	y	=	1650	....................1	
								
1300	/	(	x	+	y	)=	2	
2	(	x	+	y	)	=	1300	
2	x	+	2	y	=	1300	...............2	
Multiply (1) by	1    							
Multiply (2) by	1							
we get								
3	x	+	-3	y	=	1650		
2	x	+	2	y	=	1300		
5	x	=	2950					
/	5							
x	=	590.00	mph					
								
plug value of x in (1)				y				
3	x		-3	y	=	1650		
1770			-3	-1770	=	1650		
-3	y	=	1650					
-3	y	=	-120	mph				
	y	=	40.00					
Plane  	speed	590.00	mph					
wind   	speed	40.00	mph