Two brothers are playing a game. They walk in the same straight line from the same place in opposite directions at the same time. The elder brother walks 180 meters per minute, and the speed ratio of his younger brother is 5:4. After 3 minutes, how far is the distance between the two brothers?
兄弟俩做游戏，同时从同一地点向相反方向沿同一直线行走，哥哥每分钟走180米，与弟弟的速度比是5：4，3分钟后，兄弟俩相距多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">180 * 3 * (9/5)</gadget>
<output>972</output>

<result>972</result>