Car A and car B drive from Shanghai to Nanjing at the same time, and car A falls behind car B 20 kilometers after 4 hours. Car A travels 60 kilometers per hour, how many kilometers per hour does Car B travel?
甲、乙两辆汽车同时从上海开往南京，4小时后甲车落在乙车后面20千米．甲车每小时行60千米，乙车每小时行多少千米？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 + 60</gadget>
<output>65</output>

<result>65</result>