Question 428944
against wind  		13.00	hours						
with wind  9.88	hours						
									
Distance = same= 6175							
plane speed	=x								
wind speed	=y								
t=d/r									
6175/(x-y)=13.00		
13(x-y)=6,175.00		
13x-13y	=6175	....................1		
6175/(x	+y)=9.88		
9.88(x+y)=6175		
9.88x+9.88y=6175...............2		
Multiply (1) by 9.88								
Multiply (2) by	13.00								
we get									
128.44x	-128.44y=61009			
128.44x	+128.44y=80275			
256.88x=141284						
/256.88								
x=550mph plane speed					
									
plug value of x in (1)									
13x-13y	=6175			
7150-13y=6175			
-13y=6175-7150					
-13y=-975						
y=75mph	wind speed