a) 11:28 − 9:13 =
[R]

b) 11:07 − 9:21 =
[R]

c) 9:44 − 7:07 =
[R]

d) 7:12 − 4:17 =
[R]

e) 11:39 − 8:02 =
[R]

f) 5:00 − 1:13 =
[R]

g) 4:16 − 3:11 =
[R]

h) 11:08 − 9:40 =
[R]

i) 5:38 − 2:05 =
[R]

j) 7:01 − 5:50 =
[R]