a) 12:00 − 10:13 =
[R]

b) 8:12 − 4:28 =
[R]

c) 5:07 − 1:20 =
[R]

d) 7:02 − 3:51 =
[R]

e) 8:18 − 4:41 =
[R]

f) 7:24 − 4:00 =
[R]

g) 12:36 − 9:06 =
[R]

h) 5:18 − 2:22 =
[R]

i) 9:34 − 8:19 =
[R]

j) 5:19 − 2:04 =
[R]