So say you have 27 songs by a certain artist that you like, and 15 that you absolutely cant bare to hear. You also have 370 songs total in your ipad mini. What are the chances that you get two of your favorite songs in a row, the probability that you get one bad and one good, and two bad. So what is the probability of these if you then said that there were only 13 of the 27 favorite songs that were under 3 minutes. So the probability of you getting 2 favorite songs under 3 minutes, and then 1 favorite under 3 minutes and a really bad one.

 So 15 lanes left, so 1/15= 6% chance that he chooses the lane next to you. 7 seconds of time, so 7/45=15% chance that he jumps in during those 7 seconds. So the overall probability is 1/15 * 7/45 = 15.5 % So the guy probably choose to jump in next to you, and is incredibly inconsiderate. Eventually both people will collide. so if it takes 90 seconds for one and 100 for the other, then if we multiply it by 10 we get that after 900 seconds for You and 1000 seconds for the guy you all will collide. So after 15 min you guys will collide. Then due to the time it takes for the accident the entire pattern will be messed up and the time to collide will change.