The students participated in social practice activities, 15 people pasted 900 paper boxes in 2 hours, and the average number of paper boxes per person per hour.
同学们参加社会实践活动，15人2小时糊纸盒900只，平均每人每小时糊纸盒多少只．
<gadget id="calculator">900 / 15 / 2</gadget>
<output>30</output>

<result>30</result>