回复：10 is wrong

来源: yma16 于 2003-11-06 08:39:00 [] [旧帖] [给我悄悄话] 阅读数 : 0 (311 bytes)

Think about 2 people swaming at the same speed. They meet at the middle point and the total distance is 90m. The 2nd time they meet in the middle of the pool, they have passed 90+90=180m from the point where they first met. The answer should be 5. The first 90m gives one meet. Then each 180m gives one meet.



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