a) 10:00 − 8:06 =
[R]

b) 9:00 − 7:36 =
[R]

c) 11:12 − 7:34 =
[R]

d) 8:29 − 7:10 =
[R]

e) 6:14 − 4:22 =
[R]

f) 6:28 − 5:20 =
[R]

g) 4:04 − 1:26 =
[R]

h) 6:28 − 4:09 =
[R]

i) 4:01 − 1:08 =
[R]

j) 10:16 − 8:23 =
[R]