a) 8:30 − 5:23 =
[R]

b) 12:14 − 8:22 =
[R]

c) 12:23 − 9:32 =
[R]

d) 8:23 − 7:21 =
[R]

e) 12:36 − 9:00 =
[R]

f) 10:00 − 6:43 =
[R]

g) 12:17 − 8:22 =
[R]

h) 4:40 − 3:17 =
[R]

i) 7:01 − 5:58 =
[R]

j) 5:05 − 3:19 =
[R]