a) 3:13 − 1:30 =
[R]

b) 5:39 − 4:07 =
[R]

c) 5:16 − 3:04 =
[R]

d) 10:27 − 8:19 =
[R]

e) 10:17 − 8:14 =
[R]

f) 8:20 − 6:27 =
[R]

g) 6:11 − 4:30 =
[R]

h) 12:01 − 10:23 =
[R]

i) 2:36 − 1:12 =
[R]

j) 11:56 − 10:01 =
[R]