Xiao Ming and his parents go to the restaurant for dinner. Dad orders hot and sour potato shreds (3 minutes), Xiao Ming orders sweet and sour pork tenderloin (10 minutes), and mother orders scrambled eggs with tomatoes (5 minutes). You are invited to be a little chef. What should you do? Arrangements can minimize the sum of their waiting time? How many minutes is the minimum time?
小明和爸爸妈妈三人到饭店吃饭，爸爸点酸辣土豆丝(3分钟)、小明点糖醋里脊(10分钟)，妈妈点西红柿炒鸡蛋(5分钟)，请你来当小厨师，应怎样安排，才能使他们等候时间总和最少？最少时间是多少分钟？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">9 + 10 + 10</gadget>
<output>29</output>

<result>29</result>