exam Maths Puzzle Numerical Ability

Hi I hope this is for the correct topic I have a word problem.I have seperated the equation w=3.14n+87.1 I think that is the waste generated? However I am really confused word prob

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Two trains left a station at the same time. One travelled north at a certain speed and th eother travelled south at twice the speed. After 4 hours, the trains were 600 miles apart. How fast was each train moving? 2x2 + 3xy -4y2 when x=2 and y=4 i would like to know how they got (-80)
if any one can break it down this is from a sample test for college online