A piece of land has (2/3) hectares, and it can be plowed in (1/2) hour by 5 identical tractors. On average, how many hectares of land is plowed per tractor per hour?
一块地有(2/3)公顷，用5台同样的拖拉机(1/2)小时可以耕完．平均每台拖拉机每小时耕地多少公顷？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) / 5 / (1/2)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>