exam Maths Puzzle Numerical Ability

600?(x+20)=(600-x)/x
600/(x=20)=600/x-1
find speed of vechicle

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exam Other Question

For this one I got:
(-4 + -1s)(8 + -1s)

The problem is as follows:
Factor each of the following trinomials completely

s^2 - 4s - 32

How off am I?
5x-2y=-5
y-5x=3