The volume difference between a cylinder and a cone with the same base and height is 162 cubic meters. It is known that the circumference of their bases is 18 meters. How many meters are their heights?
等底等高的圆柱与圆锥的体积相差162立方米，已知它们的底面周长都是18米，它们的高都是多少米．
<gadget id="calculator">3 * 3.14</gadget>
<output>9.42</output>

<result>9.42</result>