Answer
D, C, A, B.
The greatest velocity is the most positive velocity, and the least velocity is the most negative velocity.
Work Step by Step
Jake's velocity relative to the ground equals the sum of his velocity relative to the train, and the train's velocity relative to the ground.
His velocities in the 4 cases, in the order ABCD, are 4 m/s, -4 m/s, 10 m/s, and 12 m/s.
