200-meter-long train passes a certain bridge at a speed of 800 meters per minute and takes 3 minutes. How long is the bridge?
一列长200米的火车以每分钟800米的速度通过某座大桥共用了3分钟，这座桥长多少米．
<gadget id="calculator">800 * 3</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 - 200</gadget>
<output>2_200</output>

<result>2_200</result>