The two ports A and B are 1200 kilometers apart. The two ships set off opposite each other at the same time. After traveling for 9 hours, the ratio of the distance traveled by the two ships to the remaining distance is 3:5. How many hours will the two ships still need to pass meet?
A，B两个港口相距1200千米，两船同时从两地相对开出，行了9小时后，两船已行路程与剩下路程的比是3：5，两船还需经过几小时相遇？
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">9 * (5/3)</gadget>
<output>15</output>

<result>15</result>