book Maths Puzzle Numerical Ability

Luke drove half the distance of a trip at a speed of 40 mph. At what speed would he have to drive for the rest of the distance so that the average speed for the entire trip would b

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book Other Question

use long division to divide the following polynomials:
1) divide 3x^4-7x^2+2x-10 by x-3
2) divide 6x^4+20x^3+13x^2-5x+2 by 2x^2-1
3) divide 4x+y by 3x-2
4) divide x^3-11 by x^2 the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 18 less than the original number. find the original number.