Question 1025411
Plane  	speed	=x	km/h					
wind   	speed	=y	km/h					
against  	wind   	5	hours					
with	wind   	3	hours					
								
Distance against 		3800	km   	distance with 		3660	km   	
t=d/r	against	wind   		-				
3800	/	(	x	-	y	)=	5	
5	(	x	-	y	)	=	3800	
5	x	-	5	y	=	3800	....................1	
								
3660	/	(	x	+	y	)=	3.00	
3.00	(	x	+	y	)	=	3660	
3.00	x	+	3.00	y	=	3660	...............2	
Multiply (1) by	4    							
Multiply (2) by	6							
we get								
20.00	x	+	-20	y	=	15200		
18.00	x	+	18	y	=	21960		
38	x	=	37160					
/	38							
x	=	978	km/h					
								
plug value of x in (1)								
5	x		-5	y	=	3800		
4889			-5	y	=	3800		
-5	y	=	3800	-4889				
-5	y	=	-1089	mph				
	y	=	218					
Plane  	speed	978	km/h					
wind   	speed	218	km/h					
								
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