The difference between the volumes of a cylinder and a cone with the same base and height is 9.42 cubic meters, find the volume of the cone.
等底等高的一个圆柱和一个圆锥的体积相差9.42立方米，求圆锥的体积．
<gadget id="calculator">9.42 / 2</gadget>
<output>4.71</output>

<result>4.71</result>