Tony traveled a total of 9 km to the southwest in 3 hours, resulting in an average velocity of 3 km/h southwest.
Tony's average velocity is calculated by dividing his total displacement by the total time taken. Since direction is given as southwest, we can assume a straight path for simplicity. Tony walks 7 km in 2 hours and then 2 km in another 1 hour in the same direction. His total displacement is 9 km southwest, and the total time is 3 hours. Divide displacement by time to find average velocity, which is 3 km/h southwest. This is a vector quantity, meaning both magnitude and direction are important.
Conclusion: Tony's average velocity for his trip is 3 km/h southwest.