a) 12:14 − 8:36 =
[R]

b) 4:15 − 2:27 =
[R]

c) 8:12 − 6:42 =
[R]

d) 11:35 − 10:19 =
[R]

e) 4:30 − 3:17 =
[R]

f) 11:12 − 10:09 =
[R]

g) 11:02 − 8:37 =
[R]

h) 6:08 − 4:01 =
[R]

i) 2:26 − 1:12 =
[R]

j) 7:07 − 3:23 =
[R]