If the lengths of the two sides of a right triangle are 3 cm and 5 cm, and they are rotated around the axes of 3 cm and 5 cm respectively, what is the volume of the two cones obtained?
一个直角三角形的两直角边长为3厘米和5厘米，分别以3厘米和5厘米为轴旋转一周，所得到两个圆锥体，体积相比多少
<result>3</result>