The distance between places A and B is 720 kilometers. Two cars drive towards each other at the same time. Car A travels 50 kilometers per hour. After 6 hours, the distance between the two cars is still 60 kilometers. How many kilometers does car B travel per hour?
A、B两地相距720千米，两辆汽车同时从两地相向开出，甲汽车每小时行50千米，6小时后两车还相距60千米，乙汽车每小时行多少千米？
<gadget id="calculator">720 - 60</gadget>
<output>660</output>

<gadget id="calculator">660 / 6</gadget>
<output>110</output>

<gadget id="calculator">110 - 60</gadget>
<output>50</output>

<result>50</result>