a) 9:00 − 5:14 =
[R]

b) 12:02 − 8:24 =
[R]

c) 12:04 − 10:39 =
[R]

d) 11:01 − 8:17 =
[R]

e) 7:34 − 4:18 =
[R]

f) 3:23 − 1:19 =
[R]

g) 9:24 − 8:16 =
[R]

h) 6:21 − 4:29 =
[R]

i) 4:18 − 2:29 =
[R]

j) 4:45 − 1:12 =
[R]