A farmer harvests crops on 2/5 acre of land in 1/3 hour. At what rate, in acres per hour, does the farmer harvest crops?
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The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm