It is a small computer game, it takes 5 minutes to play a game, and it can be played by one player or two players. Xiaodong plays with his father and mother, and each of them plays two games, at least how many minutes.
一种电脑小游戏，玩1局要5分钟，可以单人玩，也可以双人玩．小东和爸爸、妈妈一起玩，每人玩两局，至少要多少分钟．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>