Final Velocity After Elastic Collision

A hockey puck of mass 0.170 kg slides across a frictionless ice surface with a velocity of 20.0 m/s. It collides elastically with a stationary puck of mass 0.150 kg. After the collision, both pucks continue to slide on the ice. Assuming a perfectly elastic collision, what is the final velocity of the 0.150 kg puck after the collision?