The Taizishan Cement Plant had to produce 3,600 tons of cement. It was originally planned to take 60 days, but it actually took only 40 days to complete the task. How many tons more cement is actually produced per day on average than planned?
太子山水泥厂要生产3600吨水泥，原计划用60天，实际只用了40天就完成了任务．实际平均每天比计划每天多生产多少吨水泥？
<gadget id="calculator">3_600 / 40</gadget>
<output>90</output>

<gadget id="calculator">3_600 / 60</gadget>
<output>60</output>

<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<result>30</result>