(1/2) hour is how many minutes minutes.
(1/2)小时是多少分钟分钟．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 60</gadget>
<output>30</output>

<result>30</result>