a) 7:23 − 6:00 =
[R]

b) 7:12 − 6:07 =
[R]

c) 3:23 − 1:19 =
[R]

d) 6:39 − 3:16 =
[R]

e) 10:01 − 7:02 =
[R]

f) 12:13 − 8:31 =
[R]

g) 7:43 − 5:04 =
[R]

h) 12:57 − 9:02 =
[R]

i) 3:31 − 2:06 =
[R]

j) 12:23 − 9:04 =
[R]