The distance between the two cities is 920 kilometers. Cars A and B set off from cities A and B at the same time, drive toward each other, and meet each other after 4 hours. Car A travels 120 kilometers per hour, what is the speed of car B per hour? (solution by equation)
两座城市相距920千米，甲、乙两辆汽车分别从A、B两个城市同时出发，相向而行，经过4小时相遇．甲车每小时行120千米，乙车的速度是每小时行多少千米？(用方程解)
<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<gadget id="calculator">920 - 480</gadget>
<output>440</output>

<gadget id="calculator">440 / 4</gadget>
<output>110</output>

<result>110</result>