You are on a train traveling east at speed of 20.0 m/s with respect to the ground.
1) If you walk east toward the front of the train, with a speed of 1.9 m/s with respect to the train, what is your velocity with respect to the ground?
2) If you walk west toward the back of the train, with a speed of 1.3 m/s with respect to the train, what is your velocity with respect to the ground?