a) 12:21 − 10:05 =
[R]

b) 8:22 − 7:06 =
[R]

c) 4:29 − 3:14 =
[R]

d) 4:16 − 3:06 =
[R]

e) 7:18 − 4:16 =
[R]

f) 8:26 − 7:02 =
[R]

g) 9:27 − 8:10 =
[R]

h) 10:41 − 8:03 =
[R]

i) 6:13 − 3:03 =
[R]

j) 5:19 − 3:26 =
[R]