Example 2. The Louka Problem: A shipping company has a ship leaving Harvard for New York and a ship leaving New York for Harvard every noon. The journey takes seven days and seven nights in both directions. How many ships leaving New York will the ship that departs from Harvard at noon today encounter on its journey?
Solving the family of time-position broken lines shown in Figure 3, it is easy to see that, under the condition of continuous daily ship departures, starting from the 6th day, each ship departing thereafter will encounter 13 ships coming from the opposite direction.

In the case of continuous daily ship departures, starting from the 6th day, each ship departing thereafter will encounter 13 ships coming from the opposite direction.