How many minutes does it take for the minute hand on the clock to go from 5 to 9?
钟面上分针从5走到9，走了多少分钟．
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

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

<result>20</result>