exam Maths Puzzle Numerical Ability

Hi! Could someone please help me with this problem.
Let x=4,y=-3 and z=2

xy^2-3z^2
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(xy)^2(-3z)^2

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rs3+64r An express train travels 80 kilometers per hour from Ironton to Wildwood. A local train,traveling at 48 kilometers per hour, takes 2 hours longer for the same trip. How far apart are Ironton and Wildwood?