Question 562106
plane	speed=x 	mph					
wind	speed=y		mph					
with	wind	Speed =		(x+y)				
against	wind	speed=		(x-y)	

t=d/r			
d=	1012	downstream						
1012	/	(x+y)=	Speed =	11				
divide by 	11	
						
92	/	(x+y)=		1				
x+	y	92	............1					
d=	against wind	1012						
1012	/(x-y)=	22					
divide by 	22							
46	/(x-y)	=	1					
	x	-		y	=	46.00	.............2	
add up (1) & (2)								
2	x	=	138					
/	2							
x=	69	mph	speed of	plane	in still air			
plug value of x in (1)								
we get 	y= 	23	mph	speed of	wind