From 8:00 to 12:00, the fruit farmers sprayed a total of 880 fruit trees. How many fruit trees are sprayed per hour on average?
从8时到12时，果农一共给880棵果树喷洒了药水，平均每小时喷洒多少棵果树？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">880 / 4</gadget>
<output>220</output>

<result>220</result>