Xiaohu has to complete the following tasks in the morning: it takes 10 minutes to boil a pot of boiling water, 2 minutes to pour boiling water into a thermos, 5 minutes to fetch milk, and 4 minutes to pack his schoolbag. Minimal time? How many minutes at least?
小虎早晨要完成这样几件事：烧一壶开水需要10分钟，把开水灌进热水瓶需要2分钟，取奶需要5分钟，整理书包需要4分钟，为了尽快做完这些事，怎样安排才能使所用时间最少？最少需要几分钟？
<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<result>12</result>