The hour hand of a big clock is 30 cm long. How many centimeters does the tip of the hour hand travel in one day and night?
一座大钟的时针长30厘米，一昼夜时针的针尖经过的路程是多少厘米？
<gadget id="calculator">3.14 * 30 * 2 * 2</gadget>
<output>376.8</output>

<result>376.8</result>