a) 12:14 − 9:18 =
[R]

b) 12:07 − 11:04 =
[R]

c) 9:19 − 7:11 =
[R]

d) 12:06 − 8:21 =
[R]

e) 11:45 − 8:13 =
[R]

f) 5:00 − 2:10 =
[R]

g) 10:08 − 8:42 =
[R]

h) 8:05 − 6:22 =
[R]

i) 8:00 − 6:22 =
[R]

j) 9:38 − 8:08 =
[R]