exam Maths Puzzle Numerical Ability

Could you please show me step by step how to do this problem?

(x^2-6x+8)/(x-4)

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exam Other Question

12X^2-41X+24 A plane which can fly 100 miles an hour in still air can fly 500 miles with a wind which is blowing at a certain rate in 5/8 of the time it would require to fly 500 miles against a wind blowing at the same rate. What was the rate of the wind?