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问一道英语奥数题Lily wants to walk from A to B,there are two roads i

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问一道英语奥数题
Lily wants to walk from A to B,there are two roads in front of her.If a is 10km,b is 6 miles.She walked from A to B on road a at a speed of 20m every minute,and come back on road b.How long did she spend together?
回答写中文
问一道英语奥数题Lily wants to walk from A to B,there are two roads i
6英里=3公里 = 3000米 10000米10公里)

lily会走路总距离(3000+10000)m = 13000m

她会走路的速度在2000 米/分钟

所以她就花= 13000/20 = 650分