Question 742346
Plane  	speed	=x	mph					
wind   	speed	=y	mph					
against  	wind   	5	hours					
with	wind   	3	hours					
								
Distance against 		1500	miles	distance with 		1500	miles	
t=d/r	against	wind   		-				
1500	/	(	x	-	y	)=	5	
5	(	x	-	y	)	=	1500	
5	x	-	5	y	=	1500	....................1	
								
1500	/	(	x	+	y	)=	3	
3	(	x	+	y	)	=	1500	
3	x	+	3	y	=	1500	...............2	
Multiply (1) by	1    							
Multiply (2) by	1							
we get								
5	x	+	-5	y	=	1500		
3	x	+	3	y	=	1500		
8	x	=	3000					
/	8							
x	=	375.00	mph					
								
plug value of x in (1)				y				
5	x		-5	y	=	1500		
1875			-5	-1875	=	1500		
-5	y	=	1500					
-5	y	=	-375	mph				
	y	=	75.00					
Plane  	speed	375.00	mph					
wind   	speed	75.00	mph					
								
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