The kitten is grilling fish on the fire. Both sides of the fish need to be grilled. It takes 5 minutes to grill each side. The kitten can only grill two fish at the same time. Now it needs to grill 3 fish. How long will it take at least?
小猫在火上烤鱼，鱼的两面都要烤，每烤一面需要5分钟，小猫同时只能烤两条鱼，现在需要烤3条鱼，至少需要多少分钟．
<gadget id="calculator">5 + 5 + 5</gadget>
<output>15</output>

<result>15</result>