Explanation:

- Total distance: Points A and B are 200 km apart.

- Person 1's journey:

- Starts from A at 10 a.m.

- Travels at 10 km/h.

- By the time Person 2 starts at 11 a.m., Person 1 has already traveled 10 km (10 km/h * 1 hour).

- Person 2's journey:

- Starts from B at 11 a.m.

- Travels at 20 km/h.

- Remaining distance when Person 2 starts: 190 km (200 km - 10 km).

- Relative speed: Because they are moving toward each other, add their speeds: 10 km/h + 20 km/h = 30 km/h.

- Time to meet: 190 km / 30 km/h = 6.33 hours, or 6 hours 20 minutes.

- Therefore, they will meet at:

- 11 a.m. + 6 hours 20 minutes = 5:20 p.m.

Correct Answer: Option 4: 5:20 p.m.