The hour hand of an alarm clock is 5 cm long. After a day and night, how many centimeters does the tip of the hour hand travel?
一个闹钟时针长5厘米，经过一昼夜，时针尖走过多少厘米．
<gadget id="calculator">3.14 * 2 * 5</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 * 2</gadget>
<output>62.8</output>

<result>62.8</result>