On a wall clock, the minute hand is 20 cm long. From 3 o'clock to 4 o'clock, how many centimeters does the tip of the minute hand travel?
一个挂钟，分针长20厘米，从3时到4时，分针的尖端走过的路程是多少厘米？
<gadget id="calculator">3.14 * 20 * 2</gadget>
<output>125.6</output>

<result>125.6</result>