(Thinking question:) The distance between Beijing and Shanghai is 1320km. Two trains A and B depart from Beijing and Shanghai at the same time. The two trains meet after 6 hours. Train A travels 120 km per hour. How many kilometers per hour does train B travel? (solution by equation)
(思考题：)北京和上海相距1320km，甲乙两列火车同时从北京和上海相对开出，6小时后两车相遇，甲车每小时行120km，乙车每小时行多少千米？(用方程解)
<gadget id="calculator">120 * 6</gadget>
<output>720</output>

<gadget id="calculator">1_320 - 720</gadget>
<output>600</output>

<gadget id="calculator">600 / 6</gadget>
<output>100</output>

<result>100</result>