It takes 4 minutes to bake one cake, and 2 minutes to bake the front and back. A pan can bake 2 cakes at a time. How long does it take at least 5 cakes?
烙一饼要4分钟，正反面个需要2分钟，一只平底锅每次能烙2张，烙5张饼至少要多少分钟．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<result>10</result>