The distance between two stations A and B is 335 kilometers. A truck and a bus leave from the two stations at the same time. After 2.5 hours, the distance between the two cars is still 85 kilometers. The bus travels 58 kilometers per hour. How much does the truck travel per hour? rice?
甲、乙两站相距335千米，一辆货车和一辆客车同时从两站相对开出，2.5小时后两车还相距85千米，客车每小时行58千米，货车每小时行多少千米？
<gadget id="calculator">335 - 85</gadget>
<output>250</output>

<gadget id="calculator">250 / 2.5</gadget>
<output>100</output>

<gadget id="calculator">100 - 58</gadget>
<output>42</output>

<result>42</result>