Question 633003
Plane  	speed	x	mph				
wind   	speed	30	mph				
..							
against	wind   	x	-	30	mph		
with	wind   	x   	+	30	mph		
							
Distance against	wind   	350					
Distance with	wind   	500					
Time = same	equate the time against with time with current						
t=d/r							
350	/(x-	30	)=	500	/(x+	30	)
350	*(x+	30	)=	500	*(x-	30	)
350	x  	+	10500	=	500	x	-15000
350	x  	-500	x   	=	-15000	+	-10500
-150	x  	=	-25500				
/	-150						
	x=	170	mph ---- Plane speed				
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