Question 869315
rowing boat	speed	x	mph	with no	current     		
current     	speed	6	mph				
							
against	current     	x	-	6	mph		
with	current     	x   	+	6	mph		
							
Distance against	current     	10					
Distance with	current     	60					
Time = same	equate the time against with time with current						
t=d/r							
10	/(x-	6	)=	60	/(x+	6	)
10	*(x+	6	)=	60	*(x-	6	)
10	x  	+	60	=	60	x	-360
10	x  	-60	x   	=	-360	+	-60
-50	x  	=	-420				
/	-50						
	x=	8.4	mph				
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