a) 11:36 − 8:14 =
[R]

b) 7:25 − 5:03 =
[R]

c) 11:36 − 10:17 =
[R]

d) 11:05 − 8:50 =
[R]

e) 10:48 − 8:10 =
[R]

f) 6:23 − 3:24 =
[R]

g) 6:02 − 2:48 =
[R]

h) 7:42 − 6:17 =
[R]

i) 8:01 − 6:16 =
[R]

j) 12:18 − 10:05 =
[R]