a) 3:51 − 1:08 =
[R]

b) 8:07 − 6:11 =
[R]

c) 11:22 − 8:08 =
[R]

d) 12:14 − 8:29 =
[R]

e) 2:42 − 1:14 =
[R]

f) 7:09 − 3:47 =
[R]

g) 8:04 − 6:01 =
[R]

h) 9:27 − 7:11 =
[R]

i) 9:14 − 5:23 =
[R]

j) 10:18 − 8:35 =
[R]