The distance between A and B is 345 kilometers. A train has already traveled 187 kilometers. The rest of the journey is completed in 2 hours. How many kilometers does it travel per hour on average? (Column comprehensive formula solution)
甲乙两地相距345千米，一列火车已经行驶了187千米，剩下的路程用2小时行完，平均每小时行驶多少千米？(列综合算式解答)
<gadget id="calculator">345 - 187</gadget>
<output>158</output>

<gadget id="calculator">158 / 2</gadget>
<output>79</output>

<result>79</result>