The length of the railway from A to B is 345 kilometers. One train has traveled 187 kilometers. The rest of the journey will be completed in 2 hours. How many kilometers per hour on average?
从甲地到乙地的铁路长345千米，一列火车已经行了187千米，剩下的路程用2小时行完，平均每小时行多少千米？
<gadget id="calculator">345 - 187</gadget>
<output>158</output>

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

<result>79</result>