a) 12:54 − 9:03 =
[R]

b) 6:16 − 4:15 =
[R]

c) 6:29 − 5:08 =
[R]

d) 3:19 − 2:09 =
[R]

e) 12:22 − 10:24 =
[R]

f) 7:24 − 5:25 =
[R]

g) 7:22 − 6:13 =
[R]

h) 12:09 − 8:45 =
[R]

i) 6:14 − 3:02 =
[R]

j) 4:37 − 2:19 =
[R]