a) 11:26 − 9:03 =
[R]

b) 6:21 − 3:18 =
[R]

c) 3:47 − 1:11 =
[R]

d) 9:53 − 8:01 =
[R]

e) 12:27 − 9:27 =
[R]

f) 9:22 − 7:34 =
[R]

g) 3:18 − 1:06 =
[R]

h) 10:10 − 6:21 =
[R]

i) 6:26 − 3:23 =
[R]

j) 10:00 − 6:18 =
[R]