Question 558783
Plane	speed=	x	mph						
wind	speed=	y	mph						
with wind speed=		(x+y) 							
against wind speed		(x-y) 							
d=	1320								
1320	/	(x+y) 	=	15					
divide by 	15			1					
88	/	(x+y) 	=						
(x+y) 	=	88							
d=	=	1320	............1						
1320	/(x-y)=	10	against 	wind					
divide by 	10								
132	/(x-y)	=							
	x	-	1	y	=	132	.............2		
add up (1) & (2)									
2	x	=	220						
/	2								
x=	110	mph	speed of	Plane	in still air				
plug value of x in (1)									
we get 	y= 	-22	mph	speed of	wind