Four trains travel on different sections of a long straight track. Taking noth to be the positive direction, rank the trains in order by velocity, from most negative to most positive. The trains move as follows: Train A moves north with a speed of 10 m/s. Train B heads south and covers 900 m in 1 minute. Train C also heads south and has twice the speed of train A. Train D travels north and covers 24
m in 2 s.