Question 503745
Truck I	x 	km/h						
Truck II	x+	15						
..								
They are moving towards each other								They are moving towards each other
								
So add up their speed.								
								
combined speed = x+		1	x	+	15			
(	2	x	+	15	) 			
Time = 	8	hours						
Distance =   	1000	miles						
Distance = speed * time								
(	2	x		15	)*	8	=	1000
16	x 	+	120	=	1000			
16	x 	=	1000	+	-120			
16	x 	=	880					
/	16							
x=	55	mph	Truck I					
Truck II	55	+	15	=	70	mph