phisics solution

来源: 于 2003-11-07 03:44:00 [旧帖] [给我悄悄话] 本文已被阅读：次

suppose B is static, then relative speed of A to B is 5m/s, in 3 mins he can swim 1500 meters, the first time he need to swim 90 meter, and then every 180 meters they will meet once.
so 1+(1500-90)/180=9.x