Question 1026096
car I	x	mph						
car ii 	x+	20	km/h					
..								
They are moving towards each other								
								
So add up their speed.								
								
combined speed = x+		1	x	20				
(	2	x	+	20	)			
Time =	6	hours						
Distance =   	780	miles						
Distance = speed * time								
(	2	x		20	)*	6	=	780
12.00	x	+	120	=	780			
12	x	=	780	+	-120			
12	x	=	660					
/	12							
x=	55	mph						
car I	=	55	mph					
car ii 	55	+	20	=	75	km/h		
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