The new library is opened. Xiaohong goes to the library every 3 days, and Xiaoling goes every 4 days. If Xiaohong and Xiaoling meet in the library one day, how many days will it be possible for them to pass? We will meet again in the library.
新图书馆开馆了，小红每隔3天去图书馆一次，小灵每隔4天去一次，如果小红和小灵某天在图书馆相遇后，请问最少再经过多少天她们有可能会在图书馆再次相遇．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>