25 views

It takes $10$s and $15$s, respectively, for two trains traveling at a different constant speeds to completely pass a telegraph post. The length of the first train is $120$ m and that of the second train is $150$ m. The magnitude of the difference in the speeds of the two trains (in m/s) is _________

1. $2.0$
2. $10.0$
3. $12.0$
4. $22.0$

edited | 25 views