In both 1 and 2, the ball is dead because A failed to reach the lined to gain. This means that B will have 1/10 15 yards from the succeeding spot after enforcement of the UNR or the HCT.
In 3, the result of the play is K 1/10 from the K-40. The ball touched R beyond the expanded neutral zone, so K is legally allowed to recover and possess the ball. K may not advance, because the kick did not end, but they do have legal possession, so it will be a new series for K with the game clock starting on the snap (3-4-2-a,3-4-3-c).