3. At the robot running competition, a certain number of mechanisms were presented. The robots were released on the same distance in pairs. The protocol recorded the differences in the finish times of the winner and the loser in each of the races. All of them turned out to be different: 1 sec., 2 sec., 3 sec., 4 sec., 5 sec., 7 sec. It is known that during the races, each robot competed with each other exactly once, and that each robot always ran at the same speed. In your answer, indicate the time in seconds of the slowest mechanism, if the best time to complete the distance was 30 seconds.
3. At the robot running competition, a certain number of mechanisms were presented. The robots were released on the same distance in pairs. The protocol recorded the differences in the finish times of the winner and the loser in each of the races. All of them turned out to be different: 1 sec., 2 sec., 3 sec., 4 sec., 5 sec., 7 sec. It is known that during the races, each robot competed with each other exactly once, and that each robot always ran at the same speed. In the answer, indicate the time in seconds of the slowest mechanism, if the best time to complete the distance was 30 seconds.

Answer: 37.