On the clock face, how many degrees has the hour hand traveled from 9:00 am to 9:30 am?
在钟面上，时针从上午9：00走到9：30，走过了多少度．
<gadget id="calculator">6 / 360</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 30</gadget>
<output>360</output>

<gadget id="calculator">(1/60) * 360 * 2.5</gadget>
<output>15</output>

<result>15</result>