Arectangular stick of butter is placed in the microwave oven to melt. When the butter’s length is 6 in and its square cross section measures 1.5 in on a side, its length is decreasing at a rate of 0.25 in/min and its crosssectional edge is decreasing at a rate of 0.125 in/min. How fast is the butter melting (i.e., at what rate is the solid volume of butter turning to liquid) at that instant?
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