Question 476972
Plane speed	speed=	x	mph						
Wind speed	speed=	y	mph						
with wind speed=		(x+y) 							
against wind speed		(x-y) 							
d=	240								
240	/	(x+y) 	=	1.2					
divide by 	1.2								
200	/	(x+y) 	=	1					
(x+y) 	=	200	............1						
d=	=	240							
27/(x-y) 	=	1.20							
divide by 	1.20								
240	/(x-y)	=	1.5						
x	-		y	=	160	.............2		
add up (1) & (2)									
2	x	=	360						
/	2								
x=	180	mph	speed of	Plane speed	in still air				
plug value of x in (1)									
we get 	y= 	20	mph	speed of	Wind speed				
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