The daily sleep time of one-year-old children accounts for (5/8) of the whole day, and the daily sleep time of primary school children is (3/5) of one-year-old children. How many hours do primary school students sleep every day?
一周岁儿童每天的睡眠时间占全天的(5/8)，小学生每天的睡眠时间是一周岁儿童的(3/5)，小学生每天的睡眠时间是几小时？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 * (5/8) * (3/5) * 24</gadget>
<output>9</output>

<result>9</result>