a) 6:19 − 5:19 =
[R]

b) 9:31 − 7:11 =
[R]

c) 9:13 − 7:24 =
[R]

d) 7:07 − 6:06 =
[R]

e) 11:08 − 7:13 =
[R]

f) 11:29 − 9:12 =
[R]

g) 12:13 − 9:04 =
[R]

h) 9:11 − 5:45 =
[R]

i) 12:30 − 10:23 =
[R]

j) 9:18 − 6:33 =
[R]