Question 518742
plane speed	=	225	mph										
wind speed	=	x	mph										
													
speed against	wind	225	-	x					
speed with	wind	225	+	x									
													
Distance against	wind	630	m 										
Distance with 	wind	720	m 										
													
t=d/r	time against = time with												
630	/	(	225	-	x)=	720/(	225+x	)
630 (	225+	x)=	720	( 	225	-x	)			
141750	+	630	x	=	162000	-	720	x 					
720	x	630	x	=	20250								
1350	x	=	20250										
/	1350												
x 	=	15	mph	wind speed