a) 11:20 − 8:36 =
[R]

b) 7:34 − 6:16 =
[R]

c) 6:13 − 4:26 =
[R]

d) 4:22 − 1:13 =
[R]

e) 11:34 − 10:24 =
[R]

f) 12:03 − 10:47 =
[R]

g) 10:03 − 8:51 =
[R]

h) 5:03 − 2:23 =
[R]

i) 5:08 − 1:26 =
[R]

j) 9:16 − 8:11 =
[R]