exam Maths Puzzle Numerical Ability

a model is being created froma picture frame which has a length if 4 3/4 inches..if the scale to be used is 8 inches = 1 inch,what is the length of the model..???

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The speed of a passenger train is 14 mph faster than the speed of a feight train. The passenger train travels 400 mi in the same time that it takes the freight train to travel 330 mi. Find the speed of each train. How do I start to multiply this rational expression z^2 - 10z+21/z^2 - 13 + 36 divided by z^2 -11z + 24/z^2 - 9z + 14