Question 421770
against wind 8	hours					
with wind 5	hours					
								
Distance = same=	1600						
plane speed	=x							
wind speed	=y							
t=d/r								
1600/(x-y)=8.00	
8(x-y)=	1,600.00	
8x-8y=1600	....................1	
1600/	(	x	+	y	)=	5	
5	(	x	+	y	)	=	1600	
5	x	+	5	y	=	1600	...............2	
Multiply (1) by 	5							
Multiply (2) by	8							
we get								
40	x	+	-40	y	=	8000		
40	x	+	40	y	=	12800		
80	x	=	20800					
/80							
x=260 mph	plane speed				
								
plug value of x in (1)								
8x-8y=1600		
2080-8y=	1600		
-8y=1600	-2080				
-8y=-480					
y=60mph	wind speed