a) 11:25 − 9:01 =
[R]

b) 5:27 − 2:26 =
[R]

c) 11:23 − 9:06 =
[R]

d) 12:11 − 11:00 =
[R]

e) 12:33 − 10:26 =
[R]

f) 10:03 − 7:05 =
[R]

g) 8:01 − 4:17 =
[R]

h) 6:09 − 4:38 =
[R]

i) 8:34 − 7:09 =
[R]

j) 11:51 − 10:00 =
[R]