A car travels 80km per hour, how many kilometers does it travel in (1/2) hour?
一辆汽车每小时行80km，(1/2)小时行多少km．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">80 * (1/2)</gadget>
<output>40</output>

<result>40</result>