The sum of the lengths of the three sides intersecting at a vertex is 15 cm. What is the sum of the lengths of the sides of this cuboid in cm?
相交于一个顶点的三条棱长的和是15厘米，这个长方体的棱长总和是多少厘米．
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>