A4.0 kg mass is moving to the right at 3.0 m/s an 8.0 kg mass is moving to the left at 2.0 m/s. if after the collision the two masses join together what is their velocity after collision

Here we can use momentum conservation for this type of collision problem

we can say

m/s

So both of the balls will move to left with speed 0.33 m/s

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

pretty sure it's false