In a wall clock, the minute hand is 50 cm long and the hour hand is 40 cm long. What is the length of the minute hand in one revolution?
一个挂钟，分针长50厘米，时针长40厘米，分针的尖端转一圈的长度是多少厘米．
<gadget id="calculator">2 * 3.14 * 50</gadget>
<output>314</output>

<result>314</result>