Xiaoxing and Xiaoming set off from two sections of a bridge facing each other at the same time. Xiaoxing walks 75 meters per minute, and Xiaoming walks 80 meters per minute. After 3 minutes, the two meet. How long is the bridge?
小星和小明分别从一座大桥的两段同时相向出发，小星每分钟走75米，小明每分钟走80米，经过3分钟两人相遇，这座大桥长多少米？
<gadget id="calculator">75 + 80</gadget>
<output>155</output>

<gadget id="calculator">155 * 3</gadget>
<output>465</output>

<result>465</result>