June 21 this year is the "summer solstice" in the lunar calendar. On this day, Beijing's daytime is one day and night (5/8). How many hours are there in daytime in Beijing on this day?
今年6月21日是农历中的"夏至"，这一天北京的白昼时间是一昼夜的(5/8)．这一天北京的白天有多少小时？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">24 * (5/8)</gadget>
<output>15</output>

<result>15</result>