The distance between A and B is 720 kilometers. The express train travels from A to B, while the slow train travels from B to A. After 5 hours, the express train travels 74 kilometers per hour. How many kilometers per hour does the slow train travel?
甲、乙两地相距720千米，快车从甲地开往乙地，同时慢车从乙地开往甲地，经过5小时相遇，快车每小时行74千米，慢车每小时行多少千米？
<gadget id="calculator">720 / 5</gadget>
<output>144</output>

<gadget id="calculator">144 - 74</gadget>
<output>70</output>

<result>70</result>