a) 2 h after 17:25
b) 7 h after 18:45
c) 6 h before 14:30
d) 12 h before 07:21
e) 20 min after 11:55
f) 45 min after 23:00
a) 17:25 + 2:00 = 19:25
d) 07:21 - 12:00 = 19:21 (the previous day)
f) 23:00 + 00:45 = 23:45
You should try the rest !
