rectangle and a triangle have the same area. The base of the triangle is 15 meters, the height is 12.8 meters; the width of the rectangle is 8 meters, how many meters is the length?
一块长方形地和一块三角形地的面积相等．三角形的底是15米，高是12.8米；长方形的宽是8米，长是多少米？
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