The water supply company wants to lay a 1-kilometer water pipe. It has been laid for 8 days, and there is still 0.28 kilometers left unpaved. How many miles per day on average?
自来水公司要铺一条1千米的自来水管道，已经铺了8天，还有0.28千米没有铺．平均每天铺多少千米？
<gadget id="calculator">1 - 0.28</gadget>
<output>0.72</output>

<gadget id="calculator">0.72 / 8</gadget>
<output>0.09</output>

<result>0.09</result>