Xiaohong’s mother can only fry two pan-fried buns at a time. Both sides of the pan-fried buns need to be fried for 3 minutes on each side. How long does it take to fry five pan-fried buns at least?
小红妈妈煎煎包每次只能煎两个煎包两面都要煎，每面3分钟，煎5个煎包最少用多少分钟．
<gadget id="calculator">3 + 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>