tractor can cultivate 240 acres in the first 4 hours and 327 acres in the next 5 hours. How many acres does this tractor plow on average per hour?
一台拖拉机，前4小时耕地240公亩，后5小时耕地327公亩．这台拖拉机平均每小时耕地多少公亩？
<gadget id="calculator">240 + 327</gadget>
<output>567</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">567 / 9</gadget>
<output>63</output>

<result>63</result>