The road from Yongding to Fuzhou is about 500 kilometers long. A car starts from Yongding and travels 170 kilometers in 2 hours. How many kilometers are left? What is the correct column formula below
永定到福州的公路长约500千米，一辆小汽车从永定出发，2小时行了170千米，大约还剩多少千米？下面正确的列式是多少
<gadget id="calculator">500 - 170</gadget>
<output>330</output>

<result>330</result>