The railway from Beijing to Nanjing is 1162 kilometers long. An express train goes to Nanjing, and a slow train runs from Nanjing to Beijing. After 7 hours, the express train travels an average of 104 kilometers per hour. How many kilometers per hour does the slow train travel on average?
北京到南京的铁路长1162千米，一列快车开往南京，同时一列慢车从南京开往北京，经过7小时相遇，快车平均每小时行104千米，慢车平均每小时行多少千米？
<gadget id="calculator">167 - 104</gadget>
<output>63</output>

<result>63</result>