How many minutes does it take for a train 180 meters long to pass through a tunnel 1800 meters long at a speed of 54 kilometers per hour?
一列火车长180米，以每小时54千米的速度通过一条1800米长的隧道，需要多少分钟．
<gadget id="calculator">180 + 1_800</gadget>
<output>1_980</output>

<gadget id="calculator">54 / 60</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) * 1_000</gadget>
<output>900</output>

<gadget id="calculator">1_980 / 900</gadget>
<output>11/5 = around 2.2</output>

<result>11/5 = around 2.2</result>