A and B start from A and B respectively at the same time and walk toward each other. After meeting, A continues to move forward, and arrives at point B after 9 minutes, and B continues to move forward, and reaches point A after 4 minutes. Ask how many minutes after they set off for the second time they met.
甲、乙两人分别从A、B两地同时出发，相向而行．相遇后，甲继续向前走，经过9分钟到达B地，乙继续向前走，经过4分钟到达A地．问两人出发后多少分钟第二次相遇．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<result>6</result>