Mike shoots a large marble..?

Mike shoots a large marble (Marble A, mass: 0.05 kg) at a smaller marble (Marble B, mass: 0.03 kg) that is sitting still. Marble A was initially moving at a velocity of 0.6 m/s, but after the collision it has a velocity of -0.2 m/s. What is the resulting velocity of marble B after the collision? Show work please.