Uncle Wang painted a pedestrian promenade, half of the task has been completed, and (4/9) kilometers are left to be painted. How many kilometers is this pedestrian promenade?
王叔叔给一条人行长廊喷彩绘，已经完成了任务的一半，还剩(4/9)千米没有喷完，这条人行长廊长多少千米？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

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

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

<gadget id="calculator">(4/9) / (1/2)</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>