exam Maths Puzzle Numerical Ability

If I increase my usual driving speed by 10 km/h, I can drive the 255 km to Nashviille in 24 minutes less than usual. How fast do I usually drive?

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exam Other Question

find the slope and the y-intercept of the line whose equation is 2x+3y=12

and another question

write an equation of the line through (1,-3) and (-2,6) Evaluate f(-3). f(x)={-x^2+2x, x<1
{-2x+3, x>1