exam Maths Puzzle Numerical Ability

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find the distance between -1/4 and 3/5

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exam Other Question

P(x) = -.2x^2 +300x-200. What is the profit if 500 are sold? What value of x will the profit be at a maximum? A car traveling 88km/h is passed by another car going the same direction at a constant speed. After 30 seconds the two cars are 600 meters apart. Find the speed of the second car.