The distance between A and B is 243 kilometers. An express train and a local train depart from the two places at the same time, and they meet after 1.5 hours. Given that the speed of the express train is 94.5 km/h, find the speed of the slow train.
甲、乙两地相距243千米，一列快车和一列慢车同时从两地相对开出，1.5小时后相遇．已知快车速度为94.5千米/时，求慢车速度．
<gadget id="calculator">243 / 1.5</gadget>
<output>162</output>

<gadget id="calculator">162 - 94.5</gadget>
<output>67.5</output>

<result>67.5</result>