a) 3:26 − 1:12 =
[R]

b) 8:10 − 7:07 =
[R]

c) 5:19 − 3:21 =
[R]

d) 3:13 − 1:15 =
[R]

e) 6:11 − 4:40 =
[R]

f) 9:18 − 8:09 =
[R]

g) 11:42 − 8:16 =
[R]

h) 4:05 − 2:26 =
[R]

i) 7:10 − 3:17 =
[R]

j) 7:49 − 4:08 =
[R]