On the clock face, how many degrees has the hour hand turned from 3 o'clock to 7 o'clock.
钟面上，从3时到7时，时针转过了多少度．
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<gadget id="calculator">4 * 30</gadget>
<output>120</output>

<result>120</result>