a) 12:32 − 10:11 =
[R]

b) 12:15 − 10:34 =
[R]

c) 11:31 − 8:18 =
[R]

d) 10:19 − 6:32 =
[R]

e) 4:18 − 2:37 =
[R]

f) 10:03 − 6:54 =
[R]

g) 4:31 − 3:19 =
[R]

h) 8:41 − 6:13 =
[R]

i) 9:14 − 6:10 =
[R]

j) 12:05 − 8:48 =
[R]