people each take a bucket to lift water from a tap at the same time. Suppose it takes 2 minutes to fill the bucket of A, 5 minutes to fill the bucket of B, 3 minutes to fill the bucket of C, and 3 minutes to fill the bucket of D. 4 minutes. Can you think of the most reasonable order, so that the sum of the time spent by each of them (including the time spent by each person receiving water) is the least, what is this time?
4个人各拿1只水桶同时到1个自来水笼头提水，设注满甲的水桶需要2分钟，注满乙的水桶要5分钟，注满丙的水桶要3分钟，注满丁的水桶要4分钟．你能想出最合理的次序，使它们每个人所花时间的总和(包括各人自己接水所花的时间)为最少，这个时间是多少？
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

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

<gadget id="calculator">8 + 9 + 8 + 5</gadget>
<output>30</output>

<result>30</result>