At 8 o'clock in the morning, an express train and a slow train leave oppositely from the two places at the same time. The express train travels 85 meters per hour. At this time, the distance between the express train and the slow train is 12 kilometers. How many kilometers does the slow car travel per hour.
早上8时，一辆快车和一辆慢车同时从两地相对开出，快车每小时行驶85米，到上午10时，快车已驶过中点26千米．这时快车与慢车还相距12千米．慢车每小时行驶多少千米．
<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<gadget id="calculator">170 - 26</gadget>
<output>144</output>

<gadget id="calculator">144 - 38</gadget>
<output>106</output>

<gadget id="calculator">106 / 2</gadget>
<output>53</output>

<result>53</result>