Question 719418
Plane 	speed	=	75	mph														
wind   	speed	=	x	mph														
															0.60			
against 	current	=	75	-	x													
with 	current	=	75	+	x 													
																		
Total distance =		300	miles 		Total Time=	9.00	hours  											
Time upstream + time downstream =																		
																		
300	/(	75	-	x 	)+	300	/(	75	+	x 	)=	9						
300	(	75	+	x 	)+	300	(	75	-	x 	)=	9.00	(	5625	-	1	X^2	)
22500	+	300	x	+	22500	-300	x  	=	50625	-	9	X^2						
45000	-	-50625	=			-9	X^2											
-5625	=		-9	X^2														
-9	X^2=	-5625																
X^2	=	625																
X =	+/-	25																
																		
										
wind	speed 25	mph