Question 579243
Plane  	speed	=x	mph					
wind	speed	=y	mph					
against wind x-y		2	hours					
with wind x+y		6	hours					
								
Distance = 		1780	miles		distance=		440	
t=d/r	against	wind						
440.00	/	(	x	-	y	)=	2.00	
								
2.00	x	-	-2.00	y	=	440.00	....................1	
								
1780.00	/	(	x	+	y	)=	6.00	
6.00	(	x	+	y	)	=	1780.00	
6.00	x	+	6.00	y	=	1780.00	...............2	
Multiply (1) by	3.00							
Multiply (2) by	1.00							
we get								
6.00	x	+	-6.00	y	=	1320.00		
6.00	x	+	6.00	y	=	1780.00		
12.00	x	=	3100.00					
/	12.00							
x	=	258.33	mph					
								
plug value of x in (1)								
2	x		-2	y	=	440		
516.67			-2	y	=	440		
-2	y	=	440	-516.67				
-2	y	=	-76.67					
	y	=	38.33	mph	

Plane speed = 258.33 mph
wind speed = 38.33 mph

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