Question 419040
 speed in still water = x			
current speed 		2			
					
upstream speed = x-2			
downstream speed = x+2			
					
Distance= 	16 miles			
					
Time upstream + time downstream = 3hours	
t=d/r					
............
16/(x+2)+16/(x-2)=3				
LCD =	(x-2)(x	+2)								
16*(x-2)+16(x+2)=3				
16x-32+	16x+32=3(X^2-4)
32x=3X^2-12						
3X^2-32	x-12=0	

Use the quadratic formula 

b^2-4ac= 1168
x=(32+sqrt(1168))/6				
11.03	mph speed in still water