Five persons are traveling with two luggage bags.Every time,
问题描述：
Five persons are traveling with two luggage bags.Every time,
need two of them to carry the luggage they bags and they do like this in turn during the travel.Now,they have walked 15km.
Question:How many kilometers did each travel with a luggage bag on walk?
Answer:___________
A.15km B.7.5km C.6km D.30km
并说明选择答案的理由
答
我选C.因为最后问的是each person走了多远.既然他们是轮流拿,而每次一个人只拿一个.一共走了15公里,5个人,2个袋.所以每个人都有机会拿到A袋和B袋.就应该是15除5再乘2=6.