A square and a rectangle has the same circumference. The area of the square is 400 more than that of the rectangle. The length of the rectangle is three times the width. What is the area of the rectangle?
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A480fee$$t^{2}$$
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B540fee$$t^{2}$$
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C720fee$$t^{2}$$
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D960fee$$t^{2}$$
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E1200fee$$t^{2}$$
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正确答案: E