bicycle travels (3/10) kilometers per minute, how many kilometers does it travel in half an hour?
一辆自行车每分钟行驶(3/10)千米，半小时行驶多少千米．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * 30</gadget>
<output>9</output>

<result>9</result>