Question 876487
Plane	speed	=x	mph					
wind  	speed	=y	mph					
against  	wind  	5	hours					
with	wind  	3	hours					
								
Distance against 		300	miles	distance with 		330	miles	
t=d/r	against	wind  		-				
300.00	/	(	x	-	y	)=	5.00	
5.00	(	x	-	y	)	=	3.00	
5.00	x	-	5.00	y	=	300.00	....................1	
								
330.00	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	330.00	
3.00	x	+	3.00	y	=	330.00	...............2	
Multiply (1) by	3.00							
Multiply (2) by	5.00							
we get								
15.00	x	+	-15.00	y	=	900.00		
15.00	x	+	15.00	y	=	1650.00		
30.00	x	=	2550.00					
/	30.00							
x	=	85.00	mph					
								
plug value of x in (1)				y				
5.00	x		-5.00	y	=	300.00		
425.00			-5.00	-425.00	=	300.00		
-5.00	y	=	300.00					
-5.00	y	=	-125.00	mph				
	y	=	25.00					
Plane	speed	85.00	mph					
wind  	speed	25.00	mph					
								
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