Question 524123
plane speed		x	mph				
Tail wind 		35	mph
Head wind = 49				
..							
against wind   		x	-	49	mph		
with wind  		x   	+	35	mph		
							
Distance against 	wind	760					
Distance with 	wind	910					
Time = same							
760	/(x-	49	)=	910	/(x+	35	)
760	*(x+	35	)=	910	*(x-	49	)
760	x  	+	37240	=	910	x	-44590
910	x  	-760	x   	=	44590	+	37240
150	x  	=	81830				
/	150						
	x=	545.53	mph