The distance between Longnan and Guangzhou is 380 kilometers. A truck and a bus leave from the two places at the same time. After 4 hours, the distance between the two cars is still 20 kilometers. It is known that the truck travels 42.6 kilometers per hour, and the bus travels per hour. How many kilometers?
龙南到广州两地相距380千米，一辆货车和一辆客车同时从两地相对开出，4小时后两车还相距20千米，已知货车每小时行42.6千米，客车每小时行多少千米？
<gadget id="calculator">380 - 20</gadget>
<output>360</output>

<gadget id="calculator">360 / 4</gadget>
<output>90</output>

<gadget id="calculator">90 - 42.6</gadget>
<output>47.4</output>

<result>47.4</result>