"Synchronized " just means they start the same time,

來源: 2023-11-24 08:38:21 [舊帖] [給我悄悄話] 本文已被閱讀:

or, one can imagine the two trips of the same turkey being superimposed.

The solution I gave for the second problem I think is the general solution though there might be a specific one that is easier.

Still unsure of the third one.