Question 551691
plane speed	=	160	km/h										
wind speed	=	x	km/h										
wind speed													
speed against	wind	160	-	x									
speed with	wind	160	+	x									
													
Distance against	wind	350	km										
Distance with 	wind	450	km										
													
t=d/r	time against = time with			wind									
350/(160-x)=450	/(160+x	)
350(160	+x)=450	(160-x)			
56000-+	350	x	=	72000		-450	x 					
450x+350x	=	16000								
800	x	=	16000										
/	800												
x 	=	20	mph	wind speed									
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