Question 842484
boat	speed	x	mph					
current     	speed	4	mph					
								
against	current     	x	-	4	mph			
with	current     	x   	+	4	mph			
								
Distance against	current     	22						
Distance with	current     	44						
Time = same	equate the time against with time with current							
t=d/r								
22	/(x-	4	)=	44	/(x+	4	)	
22	*(x+	4	)=	44	*(x-	4	)	
22	x  	+	88	=	44	x	-176	
22	x  	-44	x   	=	-176	+	-88	
-22	x  	=	-264					
/	-22							
	x=	12	mph					
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