It is 9:00 a.m. when a train enters the bridge. The train is 300 meters long and travels 900 meters per minute. When it passes the bridge, it is just 3 minutes after 9:00 a.m. How many meters is the bridge?
一列火车上桥时是上午9时整，火车长300米，每分钟行900米，通过大桥时是9时刚过3分，这座桥有多少米？
<gadget id="calculator">3 * 900</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 - 300</gadget>
<output>2_400</output>

<result>2_400</result>