<PRE><B>Question 523144</B>
Plane I	x 	mph						
Plane II	x+	60						
..								
They are moving away from each other								
								
So add up their speed.								
								
combined speed = x+		1	x	+	60			
(	2	x	+	60	) 			
Time = 	5	hours						
Distance =   	2800	miles						
Distance = speed * time								
(	2	x		60	)*	5	=	2800
10	x 	+	300	=	2800			
10	x 	=	2800	+	-300			
10	x 	=	2500					
/	10							
x=	250	mph	Plane I					
Plane II	250	+	60	=	310	mph		
</PRE>