Xiaohua gets a haircut every 30 days, and Xiao Ming gets a haircut every 40 days. They both go for a haircut today. How many days will it take for them to go for a haircut at the same time?
小华每30天理发一次，小明每40天理发一次，他们今天同时去理发，要过多少天他们又会同时去理发？
<gadget id="calculator">2 * 2 * 2 * 3 * 5</gadget>
<output>120</output>

<result>120</result>