Physics Force & Laws Of Motion Level: Misc Level

The Artic Snow Train has a mass of 4.00 x 10 to the 5 th power kg and a top speed of 32.0 km/hr. Suppose such a train moving at top speed is hit from behind by another snow train with a mass of 1.60 x10 to the 5 th power kg and a speed of 45.0 km/hr in the same direction. what velocity of the two trains if they move off together after the collision?