Question 421847
west bound x 	mph				
east bound	x-16				
..						
They are going away from each other.						
						
So add up their speed.						
						
combined speed = x+x-16	
=2x-16		
Time = 	2	hours				
Distance =   	400	miles				
Distance = speed * time						
(2x-16)*	2
4x-32=400	
4x=400+32	
4x=432			
/12						
x=108	mph	west bound			
east bound = 108 -16 = 92 mph