It takes 4 minutes to bake a cake (2 minutes for the front and back sides), and a pan can only bake two cakes at a time. How many minutes does it take to bake three cakes at least?
烙一张饼需要4分钟(正、反两面各烙2分钟)，一只平底锅每次只能烙两张饼，烙3张饼至少需要多少分钟．
<gadget id="calculator">2 + 2 + 2</gadget>
<output>6</output>

<result>6</result>