a) 12:24 − 9:00 =
[R]

b) 4:54 − 3:02 =
[R]

c) 11:52 − 9:06 =
[R]

d) 10:21 − 7:35 =
[R]

e) 10:09 − 6:27 =
[R]

f) 12:07 − 8:12 =
[R]

g) 11:37 − 10:17 =
[R]

h) 6:34 − 5:23 =
[R]

i) 7:30 − 5:10 =
[R]

j) 10:35 − 8:19 =
[R]