Cars A and B set off from places A and B at the same time, and drive toward each other. They meet after 3 hours. A turns around and returns to A, and B continues on. After A arrives at A, he turns around and drives to B, and meets B half an hour later. How many minutes does it take B to get from A to B?
甲、乙两车分别从A，B两地同时出发，相向而行，3小时后相遇，甲掉头返回A地，乙继续前行．甲到达A地后掉头往B行驶，半小时后和乙相遇．那么乙从A到B共需多少分钟．
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">12 / 5</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">180 * (12/5)</gadget>
<output>432</output>

<result>432</result>