Day by day I think of you but cannot see you, sharing the water of the Yangtze together.?
When will this river ever rest? When will this longing end? ?
I only hope your heart is like mine, never betraying this love.
-- Li Zhiyi of the Song Dynasty,
Question: Suppose the Yangtze flows at 20 m/s, and a boat travels at 10 m/s. How long would it take for "me" to take the boat to see "you"? Conversely, how long would it take for "you" to see "me"? (PS: "I" take the boat downstream, and the Yangtze is about 6200 km long)
