A train of cars travels 72 kilometers per hour, and Xiaofang travels 4 kilometers per hour on a bicycle (2/9) less than that of a car per hour. How many kilometers per hour does Xiaofang ride a bicycle?
一列汽车每小时行72千米，小芳骑自行车每小时行的比汽车每小时行的(2/9)少4千米．小芳骑自行车每小时行多少千米？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">72 * (2/9)</gadget>
<output>16</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<result>12</result>