A piece of land has (9/10) hectares, and it can be plowed by 2 tractors in (3/4) hours. On average, how many hectares are plowed by each tractor per hour?
一块地有(9/10)公顷，用2台拖拉机耕，(3/4)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">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(9/10) / (3/4) / 2</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>