The hands on the clock face are constantly turning. From 3 o'clock to 5 o'clock, how many degrees has the hour hand turned?
钟面上的指针在不停转动，从3时到5时，时针转动了多少度．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<result>60</result>