回复：一个小学四年的题（你不见得会，不服气进来瞧瞧）

来源: 于 2003-11-05 22:19:00 [旧帖] [给我悄悄话] 本文已被阅读：次

the route of first swimmer likes a shape 'AAA', the lower-left point is the beginning, the top of 'A' is the opposite edge of the pool, the lower-right point of the shape is the ending - just three cycles in 3 minutes for the guy. The route of the second swimmer likes a shape 'W' - two cycles in 3 minutes for him. you can the two shapes cross five times.