It is about 2312 kilometers away from Beijing to Guangzhou. After a train leaves Beijing for 20 hours, it is still 952 kilometers away from Guangzhou. How many kilometers per hour does the train travel on average?
比北京到广州约2312千米，一列火车从北京开出20小时以后，离广州还有952千米．这列火车平均每小时行多少千米？
<gadget id="calculator">2_312 - 952</gadget>
<output>1_360</output>

<gadget id="calculator">1_360 / 20</gadget>
<output>68</output>

<result>68</result>