Question 578035
Boat  	speed	=	12	mph														
current  speed	=	x	mph														
																		
against current	=12-x	mph												
with 	current	=	12+x  mph 													
																		
Total distance =6	miles 	one way. 	Total Time=	1.07	hours 
1 hour 4 minutes = 1 1/15 minutes = 1.07 hours 											
Time upstream + time downstream =1.07																		
																		
6/(12-x)+6/(12+x)=1.07	
multiply eaquation by (12+x)(12-x) = 144 -x^2					
6(12+x)+6(12-x)=1.07(144-X^2)
72+6x+72-6x  	=153.65-1.07X^2						
144	-	-153.65	=		-	1.07	X^2											
-9.65	=1.07	X^2														
1.07X^2	=9.65												
x={{{sqrt(	9.65	/	1.07	)}}}												
x=	3.01	mph	

speed of current = 3 mph

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