A train travels 108 kilometers per hour, how many meters per second.
一列火车每小时行108千米，则每秒钟行多少米．
<gadget id="calculator">1 * 3_600</gadget>
<output>3_600</output>

<gadget id="calculator">1_000 / 3_600</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">108 * (5/18)</gadget>
<output>30</output>

<result>30</result>