Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| m/v ft/s | Shell (lb) | Time to ft (m) at 25° (seconds) | Time to ft (m) at 40° (seconds) | Time to ft (m) at 55° (seconds) | Max. height (ft) |
| --- | --- | --- | --- | --- | --- |
| 1990.0 | 12.5 | 10.1 | 15.5 | 22.1 | 19000.0 |
| 2200.0 | 12.5 | 9.1 | 14.1 | 19.1 | 20000.0 |
| 2500.0 | 12.5 | 8.3 | 12.6 | 16.3 | 23500.0 |
| 2000.0 | 16.0 | 9.2 | 13.7 | 18.8 | 22000.0 |
| 2350.0 | 31.0 | 4.4?? | 9.6 | 12.3 | 28750.0 |
Question:
What is the average maximum height of a shell that travels for more than 16.3 seconds at 55° and has a maximum velocity of 2200 ft/s?
Answer:
20000.0