Răspuns :
15:00 + 40min = 15:40
15:40 + 15min = 15: 55
15:55 + 40 min = 16:35
16:35 + 15 min = 16:50
16:50 + 40 min = 17: 30 termina temele
15:40 + 15min = 15: 55
15:55 + 40 min = 16:35
16:35 + 15 min = 16:50
16:50 + 40 min = 17: 30 termina temele