Car A travels 45 kilometers per hour, and car B travels 30 kilometers per hour. It is known that the road between A and B is 120 kilometers long. Both cars A and B start from A and B at the same time. When the two cars return to the starting point at the same time for the first time, how many kilometers has the second car driven?
甲车每小时行45千米，乙车每小时行30千米，已知A、B之间的公路长120千米，甲、乙两车同时从A、B两地出发，在A、B之间不断地往返行驶，当两车第一次同时回到出发点时，乙车行驶了多少千米？
<gadget id="calculator">120 * 2 * 2</gadget>
<output>480</output>

<result>480</result>