a) 12:06 − 9:29 =
[R]

b) 8:17 − 5:22 =
[R]

c) 9:14 − 6:11 =
[R]

d) 5:21 − 3:37 =
[R]

e) 12:03 − 10:15 =
[R]

f) 5:02 − 3:53 =
[R]

g) 6:36 − 5:00 =
[R]

h) 4:31 − 1:26 =
[R]

i) 5:02 − 3:50 =
[R]

j) 6:32 − 5:06 =
[R]