Three students played a total of 30 minutes on a table tennis table, how many minutes did each of them play on average?
三个学生在一张乒乓球台共打了30分钟，平均每人打了多少分钟．
<gadget id="calculator">30 + 30</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>