In the western development, an engineering team plans to install a 6.6-kilometer-long oil pipeline. It has been installed for 5 days, with an average of 0.8 kilometers per day. The rest will be installed in two days.
在西部大开发中，某工程队计划安装6.6千米长的一条输油管道，已经安装了5天，平均每天安装0.8千米，剩下的要两天安装完，平均每天要安装多少千米．
<gadget id="calculator">0.8 * 5</gadget>
<output>4</output>

<gadget id="calculator">6.6 - 4</gadget>
<output>2.6</output>

<gadget id="calculator">2.6 / 2</gadget>
<output>1.3</output>

<result>1.3</result>