Three ships leave the port on the same day, ship A returns to port once in 4 days, ship B returns to port once in 5 days, and ship C returns to port once in 3 days. How many days will it take for them to return to Hong Kong on the same day?
3艘轮船同一天离开港口，甲船4天回港一次，乙船5天回港一次，丙船3天回港一次．它们经过多少天才能同一天回港？
<gadget id="calculator">4 * 5 * 3</gadget>
<output>60</output>

<result>60</result>