Mom wants to bake three cakes, but only two can be baked in the pot each time, both sides must be baked, and each side should be baked for 3 minutes. How many minutes will it take to bake these cakes at least?
妈妈要烙三张饼，每次锅里最多只能烙2张，两面都要烙，每面烙3分钟，烙完这些饼最少要用多少分钟．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>