a) 5:27 − 3:21 =
[R]

b) 5:46 − 2:04 =
[R]

c) 5:03 − 3:24 =
[R]

d) 12:19 − 8:38 =
[R]

e) 12:07 − 9:03 =
[R]

f) 8:26 − 7:18 =
[R]

g) 3:06 − 1:22 =
[R]

h) 12:37 − 10:06 =
[R]

i) 4:24 − 1:04 =
[R]

j) 11:11 − 8:30 =
[R]