It is a small computer poker game. It takes 3 minutes to play a game. It can be played alone or in pairs. Xiaojun, Xiaohong and Xiaoliang are playing together, and each of them plays 2 rounds. How many minutes should they take at least?
一种电脑扑克小游戏，玩1局要3分钟，可以单独玩，也可以双人玩．小军、小红和小亮一起玩，每人玩2局，至少需要多少分钟？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>