<PRE><B>Question 428014</B>
let speed in still air be 		x	mph				
wind speed		10	mph				
..							
against wind   		x	-	10	mph		
with wind   		x   	+	10	mph		
							
Distance against wind		345					
Distance with tail wind		435					
Time = same							
345	/(x-	3	)=	435	/(x+	3	)
345	*(x+	3	)=	435	*(x-	3	)
345	x  	+	1035	=	435	x	-1305
435	x  	-345	x   	=	1305	+	1035
90	x  	=	2340				
/	90						
	x=	26	mph				
							
</PRE>