Xiaohong and Xiaoli went to the library at the same time today, Xiaohong went every 5 days, Xiaoli went every 6 days, at least a few days before Xiaohong and Xiaoli went to the library at the same time?
小红和小丽今天同时去了图书馆，小红每5天去1一次，小丽每6天去1次，至少再过几天小红和小丽才能同时去图书馆？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>