<PRE><B>Question 502833</B>
Plane I	x 	mph								
Plane II	x+	40								
..										
They are going away from each other.										
										
So add up their speed.										
										
combined speed = x+		1	x	+	40					
(	2	x	+	40	) 					
Time = 	5	hours								
Distance =   	2000	miles								
Distance = speed * time										
(	2	x		40	)*	5	=	2000		
10	x 	+	200	=	2000					
10	x 	=	2000	+	-200					
10	x 	=	1800							
/	10									
x=	180	mph	Plane I							
Plane II	180	+	40	=	220	mph				
</PRE>