The distance between Beijing and Shanghai is 1320 kilometers. Two direct express trains A and B depart from Beijing and Shanghai opposite each other. The two trains meet each other in 6 hours, and A train travels 100 kilometers per hour. How many kilometers does car B travel per hour? (solution by equation)
北京和上海相距1320千米，甲乙两列直快火车从北京和上海相对开出，6小时两车相遇，甲车每小时行100千米．乙车每小时行多少千米？(用方程解)
<gadget id="calculator">100 * 6</gadget>
<output>600</output>

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

<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<result>120</result>