a) 12:01 − 10:35 =
[R]

b) 12:08 − 8:50 =
[R]

c) 9:14 − 7:01 =
[R]

d) 6:04 − 4:23 =
[R]

e) 3:16 − 1:26 =
[R]

f) 5:10 − 1:20 =
[R]

g) 12:14 − 9:16 =
[R]

h) 4:09 − 1:33 =
[R]

i) 10:07 − 7:28 =
[R]

j) 6:38 − 3:11 =
[R]