Question 508978
Plane speed=	x	mph						
Wind speed =	y	mph						
with 	current speed=	(x+y) 							
against 	current speed=	(x-y) 							
d=	2520		with	Wind 					
2520	/	(x+y) 	=	4					
divide by 	4								
630	/	(x+y) 	=	1					
(x+y) 	=	630	............1						
d=	=	1720	against 	wind					
1720	/(x-y)=	4							
divide by 	4								
430	/(x-y)	=	1						
	x	-		y	=	430	.............2		
add up (1) & (2)									
2	x	=	1060						
/	2								
x=	530	mph	speed of	Plane 			
plug value of x in (1)									
we get 	y= 	100	mph		Wind speed

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