T = 0 : Start Transmission
T = TT + TP/2 : Collision
T = TT + TP : Detect Collision
T = TT + TP + TP : Clear Channel
Now, A draws K = 0, B draws K = 1
T = TT + TP + TP + TT + TP : A's Packet gets completely delivered to B
T = 2TT + 3TP
T = 2 * 10 + 3 * 6 = 38 Units