A train has a total length of 300 meters. The train passes the bridge at a speed of 20 meters per second. It takes 52.5 seconds from the front of the train to the bridge and the rear of the train to leave the bridge. How long is the bridge?
一列火车全长300米，火车以每秒20米的速度驶过大桥，从车头上桥到车尾离桥用了52.5秒，这座大桥长多少米？
<gadget id="calculator">20 * 52.5</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 - 300</gadget>
<output>750</output>

<result>750</result>