The new library is opened. Xiaohong goes to the library every 5 days, and Xiaoling goes every 3 days. After Xiaohong and Xiaoling meet in the library one day, how many days will it take for them to meet in the library? Hall meet again.
新图书馆开馆了，小红每隔5天去图书馆一次，小灵每隔3天去一次，小红和小灵某天在图书馆相遇后，再经过多少天她们有可能会在图书馆再次相遇．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>