The distance between the two stations A and B is 540 kilometers. An express train and a slow train respectively start from the two stations at the same time and run toward each other, and they meet after 3 hours. It is known that the fast train travels 110 kilometers per hour, how many kilometers per hour does the slow train travel?
甲乙两站的路程是540千米，一列快车和一列慢车分别从两站同时出发相向而行，3小时后相遇．已知快车每小时行110千米，慢车每小时行多少千米？
<gadget id="calculator">540 / 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 110</gadget>
<output>70</output>

<result>70</result>