When the hour hand goes from 2 o'clock to 5 o'clock, how much does it sweep over the clock face?
时针从2点走到5点，扫过了钟面的多少
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>