The train enters the cave tunnel, from the front of the train to the rear of the train, it takes a minute, and when the front of the train enters the cave until the rear of the train exits the cave, it takes b minutes, and b:a=8:3, and the length of the cave tunnel is 300 meters, then the length of the train is how many meters.
火车进山洞隧道，从车头进入到车尾进入洞口，共用a分钟，又当车头开始进入洞口直到车尾出洞口，共用b分钟，且b：a=8：3，又知山洞隧道长是300米，那么火车车长为多少米．
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">300 / 5</gadget>
<output>60</output>

<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<result>180</result>