<PRE><B>Question 455117</B>
East bound	x 	mph						
west bound	x+	18						
..								
They are going away from each other.								
								
So add up their speed.								
								
combined speed = x+x	+	18			
(2x+18) 			
Time = 	3 hours						
Distance =108	miles						
Distance = speed * time								
(2x+18)*3=108
6x+54=108			
6x=108-54			
6x=54					
/6							
x=9	mph	East bound					
west bound	9+18=27	mph		</PRE>