How many seconds did it take for the second hand to go from the number "5" to the number "8".
秒针从数字"5"走到数字"8"经过了多少秒．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

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

<result>15</result>