Question 553313
Plane 	speed	=x	mph					
wind speed	speed	=y	mph					
against  wind x-y		5.00	hours					
with wind x+y		4.00	hours					
								
Distance = same=		2000	miles					
t=d/r								
2000	/	(	x	-	y	)=	5.00	
5	(	x	-	y	)	=	2,000.00	
5	x		-5	y	=	2000	....................1	
2000	/	(	x	+	y	)=	4.00	
4.00	(	x	+	y	)	=	2000	
4.00	x	+	4.00	y	=	2000	...............2	
Multiply (1) by 	4.00							
Multiply (2) by	5.00							
we get								
20	x	+	-20	y	=	8000		
20	x	+	20	y	=	10000		
40	x	=	18000					
/	40							
x 	=	450	mph					
								
plug value of x in (1)								
5	x		-5	y	=	2000		
2250			-5	y	=	2000		
-5	y	=	2000	-2250				
-5	y	=	-250					
	y	=	50	mph