It takes 15 seconds for a train to travel at a constant speed to completely pass through a 2,500-meter-long tunnel. There is a light on the top of the tunnel, which shines vertically downward. It takes 10 seconds for the light to fully shine on the train. Based on the above data, find The length of the train?
一列火车匀速行驶，完全经过一条长2500米的隧道需要15秒的时间，隧道的顶上有一盏灯，垂直向下发光，灯光完全照在火车上的时间是10秒，根据以上数据，求出火车的长度？
<gadget id="calculator">2_500 / 15</gadget>
<output>500/3 = around 166.666667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(500/3) / (1/30)</gadget>
<output>5_000</output>

<result>5_000</result>