a) 8:15 − 6:13 =
[R]

b) 4:33 − 2:15 =
[R]

c) 6:36 − 4:21 =
[R]

d) 10:57 − 8:02 =
[R]

e) 5:31 − 3:20 =
[R]

f) 6:11 − 3:25 =
[R]

g) 11:23 − 8:32 =
[R]

h) 11:03 − 8:24 =
[R]

i) 9:55 − 6:01 =
[R]

j) 9:05 − 6:49 =
[R]