book Maths Puzzle Numerical Ability

A car moving at 50km/h skids 15m with locked brakes. How far will the car skid with locked brakes at 150km/h?

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book Other Question

If x = 72 and y = -54 - x/6, what is the value of y? HI! I need help understanding the steps in solving this problem:

(X+2)^3-(X+2)^2-(X+2)+2

I know the answer is x^3+5x^2+7x+4 but I get lost in the steps. THANX!