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A truck is to be driven 300 km on a high...

A truck is to be driven 300 km on a highway at a constant speed of.x kmph. Speed rules of the highway required that `30<=x<=60` . The fuel costs Rs. 10 per litre and is consumed at the rate of `2+x^2/600` litres per hour. The wages of the driver are Rs. 200 per hour. The most economical speed to drive the truck, in kmph, is

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