How long does it take to boil two eggs if it takes four and a half min-utes to boil one egg?中文

问题描述:

How long does it take to boil two eggs if it takes four and a half min-utes to boil one egg?中文

如果煮一个鸡蛋需要四个半分钟,那么煮两个鸡蛋要花费多长时间?