A tractor plows two pieces of land. The first piece of land is rectangular with an area of 9600 square meters. It takes 2.4 hours to plow. The second piece of land is a right-angled triangle with two right-angled sides of 180 meters and 140 meters respectively. It takes 3.6 After hours of plowing, how many square meters per hour does this tractor plow the two lands on average?
一台拖拉机耕两块地，第一块地是长方形，面积是9600平方米，用2.4小时耕完，第二块地是直角三角形，两条直角边分别是180米和140米，用了3.6小时耕完，这台拖拉机耕这两块地平均每小时耕多少平方米？
<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">180 * 70</gadget>
<output>12_600</output>

<gadget id="calculator">9_600 + 12_600</gadget>
<output>22_200</output>

<gadget id="calculator">2.4 + 3.6</gadget>
<output>6</output>

<gadget id="calculator">22_200 / 6</gadget>
<output>3_700</output>

<result>3_700</result>