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[" A truck is to be driven 300"km" on a ...

[" 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.10per litre and is consumed at the rate of "2+(x^(2))/(600)" liters "],[" per hour.The wages of the driver are Rs.200per hour.The most economical speed to dive the truck,"],[" in kmph,is "]

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