book Maths Puzzle Numerical Ability

Two cars started from the same point and traveled on a straight course in opposite directions for exactly 2 hours, at which they were 208 miles apart. If one car traveled, on aver

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i am having problems with the slopes in graphing equations. i have
(4,5) (2,3)
m=3-52-4 = -2-2
now i am suppose to write weather the line is vertical or horizontal....how do if the product of two consecutive odd integers is decreased by one third the lessre the integer, the result is 250. find the integers.