a) 11:30 − 10:12 =
[R]

b) 11:37 − 9:03 =
[R]

c) 9:18 − 8:16 =
[R]

d) 5:08 − 1:26 =
[R]

e) 12:21 − 9:31 =
[R]

f) 12:12 − 9:44 =
[R]

g) 10:15 − 9:08 =
[R]

h) 5:27 − 4:07 =
[R]

i) 7:01 − 5:27 =
[R]

j) 11:19 − 8:15 =
[R]