Xiao Ming’s speed is 3.6 kilometers per hour when going uphill, and 4.5 kilometers per hour when going downhill. There is a small slope. It takes Xiaoming 1.8 hours to go uphill and then downhill along the original road. What is the length of this slope? rice.
小明上坡时速度为每小时3.6千米，下坡时速度为每小时4.5千米，有一个小斜坡，小明上坡再沿原路下坡共用了1.8小时，这段斜坡的长度是多少千米．
<gadget id="calculator">1.8 * 4.5</gadget>
<output>8.1</output>

<gadget id="calculator">3.6 + 4.5</gadget>
<output>8.1</output>

<gadget id="calculator">8.1 / 8.1</gadget>
<output>1</output>

<gadget id="calculator">3.6 * 1</gadget>
<output>3.6</output>

<result>3.6</result>