Physics word problem please help!!!?

A 24.0 g marble sliding to the right at 19.2 cm/s overtakes and collides elastically with a 9.8 g marble moving in the same direction at 14.5 cm/s. After the collision, the 9.8 g marble moves to the right at 16.2 cm/s. Find the velocity of the 24.0 g marble after the collision.