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The amount A of petrol (in litres) required for a car to travel a distance d (in km) at a constant speed 1; is given

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The amount A of petrol (in litres) required for a car to travel a distance d (in km) at a constant speed 1; is given by d A=av2d+b;, where a and b are positive constants. How fast should the car be driven if we want to minimise the amount of petrol required for a trip of 100krn

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