a) 8:37 − 7:09 =
[R]

b) 12:12 − 11:02 =
[R]

c) 8:12 − 5:16 =
[R]

d) 9:00 − 7:50 =
[R]

e) 8:28 − 6:09 =
[R]

f) 7:17 − 4:39 =
[R]

g) 12:29 − 9:15 =
[R]

h) 10:33 − 7:19 =
[R]

i) 11:23 − 9:21 =
[R]

j) 7:25 − 5:34 =
[R]