Speed and Velocity

“A train travels from City A to City B, which are 200 km apart. It takes 2.5 hours. Would you primarily use speed or velocity to describe the train's motion if you only care about the time it takes to get from one city to the other? Explain your choice. A delivery drone flies 50 meters north, then 30 meters east, and then 10 meters south to deliver a package. Would you primarily use speed or velocity to describe the drone's motion when calculating its overall efficiency in delivering the package to the correct location? Explain your choice.”