A 450-meter-long train with a speed of 1200 m/min takes 1.5 minutes to pass a bridge. How long is the bridge?
一列450米长的火车，速度为1200米/分，通过一座桥用了1.5分钟，桥长多少米？
<gadget id="calculator">1_200 * 1.5</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 450</gadget>
<output>1_350</output>

<result>1_350</result>