To pave a (4/5) kilometer sidewalk, half of the task was completed in 4 days, how many kilometers per day on average?
给一条(4/5)千米的人行道铺地砖，4天完成了任务的一半，平均每天铺多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</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">(4/5) * (1/8)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>