a) 11:09 − 8:34 =
[R]

b) 8:27 − 6:16 =
[R]

c) 9:06 − 6:41 =
[R]

d) 4:42 − 3:02 =
[R]

e) 5:17 − 1:42 =
[R]

f) 3:19 − 1:04 =
[R]

g) 2:12 − 1:10 =
[R]

h) 4:32 − 3:09 =
[R]

i) 5:32 − 2:10 =
[R]

j) 9:23 − 6:28 =
[R]