Three trucks come to the yard at the same time to load goods. It takes 4 hours for truck A, 3 hours for truck B, and 6 hours for truck C. How to arrange their order so that the total time they wait is the least? How many hours will we have to wait?
三辆货车同时来到货场装货，甲车要用4小时，乙车要用3小时，丙车要用6小时．怎样安排他们的顺序，使他们等候的总时间最少？共要等几小时？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">9 + 8 + 6</gadget>
<output>23</output>

<result>23</result>