The speed of a train is 180 km/h. The speed of a car is (4/9) of the train and (1/9) of an airplane. What is the speed of the airplane in kilometers?
一列火车的速度是180千米/时，一辆小汽车的速度是这列火车的(4/9)，是一架飞机的(1/9)，这架飞机的速度是多少千米？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(4/9) / (1/9)</gadget>
<output>4</output>

<gadget id="calculator">180 * 4</gadget>
<output>720</output>

<result>720</result>