exam Maths Puzzle Numerical Ability

Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle.

note I really would like some help as to how to setup this question. Thank you!

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exam Other Question

simplify the rational expression

x2 - 6x + 8
-------------
x2 - 4

please help I need one good example to make sure I am doing this right. 2. x+3y=-9 Question: Add -9 to both sides of Equation. Do this by adding -9 to the right side, and x+3y (Which equals -9) to the left side. The resulting equation should have only x as the variable. The y should have been eliminated.