One pot can fry 2 cakes at a time. To fry 5 cakes, 2 minutes on each side, and both sides must be fried, how long will it take at the fastest?
一口锅每次可以煎2个饼．要煎5个饼，每面2分钟，两面都要煎，最快需要多长时间？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

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

<result>10</result>