Question 690998
Plane  	speed	=x	mph					
wind   	speed	=y	mph					
against 	wind   	3	hours					
with 	wind   	2	hours					
								
Distance with	wind   	600	miles		distance against	wind   	600	
t=d/r	against	wind   	(x-y)					
600.00	/	(	x	-	y	)=	3.00	
								
3.00	x	-	-3.00	y	=	600.00	....................1	
with	wind   	(x+y)						
600.00	/	(	x	+	y	)=	2.00	
2.00	(	x	+	y	)	=	600.00	
2.00	x	+	2.00	y	=	600.00	...............2	
Multiply (1) by	2.00							
Multiply (2) by	3.00							
we get				y				
6.00	x	+	-6.00	y	=	1200.00		
6.00	x	+	6.00		=	1800.00		
12.00	x	=	3000.00					
/	12.00							
x	=	250	mph					
								
plug value of x in (1)				y				
3	x		-3	y	=	600		
750			-3	-750	=	600		
-3	y	=	600					
-3	y	=	-150	mph				
	y	=	50					
Plane  	250	mph						
wind   	50	mph