How much does the second hand go from the number "3" to the number "6".
秒针从数字"3"走到数字"6"，经过了多少．
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

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

<result>15</result>