To pave a sidewalk (8/9) kilometers long, half of the task is completed in 4 days, how many kilometers per day is paved on average?
给一条长(8/9)千米的人行道铺砖，4天完成了任务的一半，平均每天铺多少千米？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

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

<gadget id="calculator">(1/2) / 4</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(8/9) * (1/8)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>