Question 546452
Boat speed		x	mph				
current speed 		2	mph				
..							
against wind   		x	-	2	mph		
with wind  		x   	+	2	mph		
							
Distance against 	current	18					
Distance with 	current	26					
Time = same	equate the time against to time with current						
t=d/r							
18	/(x-	2	)=	26	/(x+	2	)
18	*(x+	2	)=	26	*(x-	2	)
18	x  	+	36	=	26	x	-52
26	x  	-18	x   	=	52	+	36
8	x  	=	88				
/	8						
	x=	11	mph				
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