well

来源: 于 2005-07-08 15:31:42 [旧帖] [给我悄悄话] 本文已被阅读：次

if I am the driver on the first car, assume it starts at 1:00, then at 1:30 I will meet the first car from the opposite direction at the middle point of the road. So it's going to be 7 in total.

if this traffic is going on and on and on, it's probably 13.