The minute hand of a wall clock is 6 decimeters long, what is the distance traveled by the minute hand in 40 minutes?
一个挂钟的分针长6分米，经过40分钟分针走过的路程是多少．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">40 / 60</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3.14 * 6 * 2 * (2/3)</gadget>
<output>25.12</output>

<result>25.12</result>