book Maths Puzzle Numerical Ability

Determine Slope. A man decends 1800 feet of elevation @ 3.25 miles horizontally away from the top of the mountain. What is the slope of decent

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I have been working on this all day. could someone explain this problem to me i am working with adding and subtracting rational expressions with different denominators.

4x/2x^2 + x - 10 - 9x/x^2 + x - 6 a> IS it possible to have proj(a)u=Proj(u)a? explain the reasoning
b> if u is not equal to 0, is it valid ti cancel u from both sides of the equation u*v=u*w and conclude that v=w