March 12th is Arbor Day. From 9:00 am to 4:00 pm, all the teachers and students of the third grade planted 245 trees. How many trees are planted per hour on average?
3月12日是植树节，从上午9时到下午4时，三年级全体师生共植树245棵．平均每小时植树多少棵？
<gadget id="calculator">245 / 7</gadget>
<output>35</output>

<result>35</result>