How many minutes did it take for the minute hand to move from "2" to "6".
分针从"2"走到"6"经过了多少分钟．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>