section of road is 86 kilometers long. A car starts at 8 o'clock, rests for two hours, and completes the journey at 12 noon. How many kilometers per hour? (Solution of column equation)
一段路长86千米，一辆车8点钟出发，中途休息两个小时，中午12点跑完全程，每小时行多少千米？(列方程解)
<gadget id="calculator">12 - 8 - 2</gadget>
<output>2</output>

<gadget id="calculator">86 / 2</gadget>
<output>43</output>

<result>43</result>