a) 8:32 − 5:01 =
[R]

b) 10:11 − 8:32 =
[R]

c) 10:18 − 7:40 =
[R]

d) 8:40 − 7:17 =
[R]

e) 6:42 − 5:17 =
[R]

f) 5:13 − 3:11 =
[R]

g) 10:26 − 8:13 =
[R]

h) 9:37 − 8:03 =
[R]

i) 10:24 − 7:19 =
[R]

j) 8:31 − 7:19 =
[R]