a) 11:12 − 8:26 =
[R]

b) 12:05 − 9:31 =
[R]

c) 8:34 − 5:03 =
[R]

d) 6:52 − 3:03 =
[R]

e) 10:15 − 6:22 =
[R]

f) 7:15 − 5:26 =
[R]

g) 7:04 − 4:00 =
[R]

h) 3:04 − 1:38 =
[R]

i) 9:30 − 6:23 =
[R]

j) 3:07 − 1:46 =
[R]