What is the elapsed time when the second hand goes from number 3 to number 6
秒针从数字3走到数字6，经过的时间是多少
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>