From 3:00 pm to 6:00 pm, the third graders watered 906 trees in total. How many trees do they water per hour on average?
从下午3时到下午6时，三年级同学共浇了906棵树．他们平均每小时浇多少棵？
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">906 / 3</gadget>
<output>302</output>

<result>302</result>