The students went to water the trees. They watered 4 hours in the morning, 56 trees per hour, and 3 hours in the afternoon, 42 trees per hour. Do the math, how many trees are watered per hour on average on this day?
同学们去浇树，上午浇了4小时，每小时浇56棵，下午浇了3小时，每小时浇42棵．算一算，这一天平均每小时浇树多少棵？
<gadget id="calculator">56 * 4</gadget>
<output>224</output>

<gadget id="calculator">42 * 3</gadget>
<output>126</output>

<gadget id="calculator">224 + 126</gadget>
<output>350</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">350 / 7</gadget>
<output>50</output>

<result>50</result>