Япоставил цифровые часы на зеркало время 18: 30 на часах и зеркале читается одинаково какое другое время обладает таким же свойством

вариантов много.

13:00, 13:01 13:03, 13:08, 13:10, 13:11, 13:13, 13:18, 13:30,13:31, 13:33, 13:38

18:00, 18:01, 18:03, 18:08 , 18:10, 18:11, 18:13, 18:18,  18:31,  18:33, 18:38

если электронные часы показывают впереди ноль, то можно

00:00, 00:01, 00:03, 00:08, 00:10, 00:11, 00:13, 00:18, 00:30, 00:31, 00:33, 00:38

03:00, 03:03, 03:08, 03:10, 03:11, 03:13, 03:18, 03:30, 03:31, 03:33, 03:38

01:01, 01:03, 01:08, 01:10, 01:11, 01:13, 01:18, 01:30, 01:31, 01:33, 01:38

08:01, 08:03, 08:08, 08:10, 08:11, 08:13, 08:18, 08:30, 08:31, 08:33, 08:38

если электронные часы ноль впереди не показывают, то

0:00, 0:01, 0:03, 0:08, 0:10, 0:11, 0:13, 0:18, 0:30, 0:31, 0:33, 0:38

3:00, 3:03, 3:08, 3:10, 3:11, 3:13, 3:18, 3:30, 3:31, 3:33, 3:38

1:01, 1:03, 1:08, 1:10, 1:11, 1:13, 1:18, 1:30, 1:31, 1:33, 1:38

8:01, 8:03, 8:08, 8:10, 8:11, 8:13, 8:18, 8:30, 8:31, 8:33, 8:38