The total length of the road from A to B is 500 kilometers. A car starts from A to B and travels 80 kilometers per hour. It has already traveled for 2 hours. If the remaining distance is 4 hours, it will reach B. , how many kilometers per hour on average?
从甲地到乙地公路全长500千米，一辆汽车从甲地出发到乙地，每小时行80千米，已经行了2小时，剩下的路程若要再行4小时到乙地，则平均每小时行多少千米？
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">500 - 160</gadget>
<output>340</output>

<gadget id="calculator">340 / 4</gadget>
<output>85</output>

<result>85</result>