An express train and a slow train depart from places A and B which are 468 kilometers apart at the same time. The express train travels 65 kilometers per hour. After 4 hours of meeting, how many kilometers per hour does the slow train travel?
一列快车和一列慢车同时从相距468千米的甲、乙两地相对开出，快车每小时行驶65千米，经过4小时相遇，慢车每小时行驶多少千米？
<gadget id="calculator">468 / 4</gadget>
<output>117</output>

<gadget id="calculator">117 - 65</gadget>
<output>52</output>

<result>52</result>