A piece of land has (7/9) hectares, and it will be plowed by 2 tractors in (2/3) hours. On average, how many hectares of land is plowed per tractor per hour?
一块地有(7/9)公顷，用2台拖拉机耕，(2/3)小时耕完．平均每台拖拉机每小时耕地多少公顷？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(7/9) / 2 / (2/3)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>