Lay square tiles on a rectangular wall with a length of 5.5 meters and a width of 3 meters, which is just finished. What is the longest side length of this tile?
在一块长5.5米，宽3米的长方形墙壁上铺上正方形瓷砖，正好铺完．这种瓷砖的边长最长是多少？
<gadget id="calculator">2 * 5 * 5</gadget>
<output>50</output>

<result>50</result>