Two bowling balls are rolling toward each other. One of the balls, ball A, is 12 kg traveling to the right at a velocity of 3 m/s, while the other ball, ball B, is 4 kg traveling at a velocity of 1 m/s to the left. They collide with each other and ball A bounces back to the left at a velocity of 1.2 m/s. How much velocity does ball B now have traveling to the right?