a) 11:38 − 10:01 =
[R]

b) 6:20 − 3:01 =
[R]

c) 12:16 − 9:08 =
[R]

d) 12:12 − 10:23 =
[R]

e) 5:02 − 1:25 =
[R]

f) 8:33 − 7:14 =
[R]

g) 10:44 − 8:12 =
[R]

h) 6:06 − 2:27 =
[R]

i) 7:17 − 5:14 =
[R]

j) 7:34 − 4:23 =
[R]