The minute hand of a clock is 5 cm long, how many centimeters does the tip of the needle travel in 1 hour?
某钟表的分针长5厘米，经过1小时，针尖走过了多少厘米．
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<result>31.4</result>