Try this

来源: jay_walker 于 2009-02-01 21:55:10 [] [旧帖] [给我悄悄话] 阅读数 : (172 bytes)

A speed Va=1000/T (T=time used fot first race)b=
B speed Vb=(1000-50)/T=950/T

For second race:

A time Ta =1050/Va=1050T/1000
B Time Tb=1000/Vb=1000T/950

所有跟帖： 

• A Won again -jay_walker- ♀ 给 jay_walker 发送悄悄话 (0 bytes) () 02/01/2009 postreply 21:58:25

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