A motorcycle travels (1/2) kilometers per minute, how many kilometers does it travel in (1/2) hours.
一辆摩托车每分钟行驶(1/2)千米，(1/2)小时行驶多少千米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<result>15</result>