a) 7:27 − 4:21 =
[R]

b) 11:11 − 9:42 =
[R]

c) 4:13 − 2:05 =
[R]

d) 4:51 − 2:01 =
[R]

e) 6:28 − 5:07 =
[R]

f) 9:17 − 8:01 =
[R]

g) 5:19 − 3:32 =
[R]

h) 11:10 − 8:23 =
[R]

i) 12:12 − 10:16 =
[R]

j) 11:11 − 7:40 =
[R]