There were 5156 students in a school last year. This year 285 students joined kindergarten and 355 students passed out and joined college. Also, 368 students were transferred to other schools, and 382 students were transferred from other schools. How many students are there in the school now?
Ariel, Putri and Nurul are practicing for the school races. Ariel is the youngest, and can run a lap in 132 seconds. Putri can run a lap in 36 seconds. The oldest student, Nurul can run a lap in 24 seconds. They start running at the same time from the starting line. After how many seconds will they all meet at the starting line?