Mom is going to make 3 pancakes, and each pancake must be fried for 3 minutes on both sides of the pancake. Now there are two stoves, and each stove can only cook one side of a pancake at a time. What is the minimum time it takes to cook all the pancakes?
妈妈要做3个煎饼，每制作一个煎饼必须把这个煎饼正反两面各煎3分钟．现在有两个炉子，每个炉子每次只能煎1个煎饼的某一面．要想煎好所有的煎饼，最少需要花多少时间？
<gadget id="calculator">3 + 3 + 3</gadget>
<output>9</output>

<result>9</result>