Question 437577
against wind   		2.00	hours						
with wind  		1.50	hours						
									
Distance = same=900							
plane speed	=x								
wind speed	=y								
t=d/r									
900/(x-y)=2.00		
2(x-y)=	900.00		
2x-2y=900	....................1		
900/(x+y)=1.50		
1.50(x+	y)=900		
1.50x+1.50y=900	...............2		
Multiply (1) by 	1.50								
Multiply (2) by	2.00								
we get									
3x-3y=1350			
3x+3y=1800			
6x=3150						
/6								
x=525mph	plane speed					
									
plug value of x in (1)									
2x-2y=900			
1050-2y	=900			
-2y=900-1050				
-2y=-150						
y=75 mph	wind speed