<PRE><B>Question 426472</B>
Plane A	x mph						
Plane B	x+120 mph						
..								
They are going away from each other.					
So add up their speed.								
								
combined speed = x+x+120			
=2x+120 			
Time = 	3	hours						
Distance =   	1500	miles						
Distance = speed * time								
(2x+120	)*3=1500
6x+360=	1500			
6x=1500	-360			
6x=1140					
/6							
x=190	mph	Plane A					
Plane B	190+120	=310mph		
								
</PRE>