The hour hand of a wall clock is 5 cm long. After 12 hours, how many decimeters has the tip of the hour hand moved?
一只挂钟的时针长5厘米，经过12小时，这个时针尖端移动了多少分米．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3.14 * 5 * (1/5)</gadget>
<output>3.14</output>

<result>3.14</result>