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Three train carriages, A, B and C, are on the same track with B between A...

Three train carriages, A, B and C, are on the same track with B between A and C. They all have the same mass, ?, and B is coupled with C. The coupling can be described as a massless spring with the spring constant ?. B and C stand still on the track, while A moves towards B at a constant speed ?0.
A abuts B and undergoes a completely elastic collision. What is the velocity of A (??), B (??), and C (??) at the moment immediately after the collision?
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