The minute hand of a wall clock is 15 cm long. How many centimeters does the tip of the minute hand travel after 20 minutes?
一个挂钟的分针长15厘米，经过20分钟后，这根分针的尖端所行的路程走了多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 15 * 2 * (1/3)</gadget>
<output>31.4</output>

<result>31.4</result>