In the pan, only two fish can be fried at a time, and each fish should be fried on both sides, and one side should be fried for 3 minutes. How long does it take at least 5 minutes to fry 5 fish?
平底锅中，一次只能煎两条鱼，每条鱼要煎两面，一面要煎3分钟．煎5条鱼，至少需要多少分钟．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">6 + 9</gadget>
<output>15</output>

<result>15</result>